1. After a quick brainstorming, I have these things in mind: audio streaming, portable Bluetooth speakers, CIEM companies offering universal fit models for sale, the better awareness of impedance matching and high quality Bluetooth codecs.
Streaming: not much to explain here; many people get access to a plethora of music albums for a flat rate price and don't need much storage space. Probably not as good for the artists and labels as if people bought the CDs, but still better than many of those people who are illegally getting their music. Although I am a CD guy and buy new CDs for listening at home and to have a physical medium, I have a Spotify account (once premium for a few months but as I didn't use it much, I downgraded to the free version and haven't touched it since then) and will be having a 6 months Tidal premium account soon.
Bluetooth speakers: going on holiday, listening to music while ironing or in the garden plus at barbecues, portable Bluetooth speakers are handy and some are said to be decently sounding. Having tested the predecessors of portable Bluetooth speakers (sound docks) a few years ago, not even the companies' flagship models between €500 and 800 were able to convince me, so I bought nothing. I am not really up to date though, not having heard the recent products, and might take a look at portable wireless speakers again.
UIEMs from CIEM companies: let's face it - if one's ears are about perfect for universal fit in-ears, there is no major point to go for CIEMs unless there is one CIEM that offers just exactly the tonal attributes one is looking for. I have large auricles with wide, quite straight ear canals and honestly prefer the handling of UIEMs over my CIEMs as I have about never had problems with universal fit IEMs, therefore I would always go for the universal version of a model if a company is offering both custom as well as universal fit models of the same in-ear. Seeing more and more CIEM companies also offering universal fit models is a very welcome thing.
Better awareness of impedance matching: be it the different audio chips or the better awareness of it at the manufacturers' side, I don't know. Nonetheless, I have the feeling that especially in the past decade, manufacturers concentrate even more on making audio devices with really low output impedance. People like myself who have many multi-driver IEMs with varying impedance over the frequency range are very happy if a source has got a low resistance at the audio output (less than 1 Ohm), so that the frequency response output remains unaltered.
High Quality Bluetooth codecs: I remember about 10 to 14 years ago, I encountered Bluetooth for the first time. It was a cool thing transferring files from one device to another without using cables and without requiring both devices to stay extremely close to each other (cough cough, infrared data transmission as used in my Casio watch computer or PDAs). What wasn't so cool though was the audio quality over Bluetooth back in the days: full of artefacts, high audible compression plus flat sound. Bluetooth just wasn't audiophile in its early days. The development of AAC and aptX codecs for wireless audio transmission is a huge step forward in terms of audio quality, and even some devices without these codecs sound decent.
2. In my opinion, audiophile communities are a good way for the manufacturer to get aware of many peoples' desires, feedback and questions. It is also a good way to publicly get in touch with others (for the audiophiles to submit suggestions etc. to the manufacturer and for the manufacturer to make product announcements or assist owners of their products with theirs questions and needs). It is also a really good platform for marketing and placing ads, as audiophile online communities are one target audience with many people that will see the infos and ads.
3. My crystal ball is currently sent in for repair, so I can't say anything about that right now
. All joking aside, I don't know. We've seen many hybrid IEMs being developed in the past years, so I think this might be a trend that will be continued.
Oh, and Bluetooth of course - aptX and AAC streaming are getting better and better, and so is audio quality over Bluetooth. Some stationary DACs with Bluetooth even sound as good as with wired connection, so I am assuming that at one point, we are going to see Bluetooth headphones that will sound just as good as wired models.
I also guess that with all of the popular music streaming companies, the market for streaming DAPs will be growing.
Disk space is becoming cheaper every year, and I am sure that we will be seeing reasonably priced 512 (or even 1024) GB micro SD cards in around 10 years.
Crowdfunding platforms will surely get more attention in the audiophile and consumer-audiophile world as well.
Surely there will also be negative things we are going to face: I fear that CDs will slowly disappear and that some labels (especially smaller ones) will only back on digital distribution, which is already a trend that can be seen.