To be honest, almost any decent pair of headphones would be fine as a long term all arounder for most people. What makes it not so is that this is a site built around hobbiests. So you do get sucked into it.
If someone were to come here, take a look around for a day or two (reading a lot and asking a couple of questions), he/she could make a purchase desicion that would lead to a very satisfying result 99% of the time, IF (and only if) he/she was wise enough never to return to Head-Fi!
I'm serious about this. I've got a Panasonic FZ-20 digital camera and I'm as pleased as can be with it. I'm sure there were a zillion other choices then and even more now, each of which will offer some features that are "different" and in some cases clearly "better". But my camera suits my needs just fine. I don't use it often. Normally just when I'm travelling. It's easy to use, fairly small and light weight, takes great pictures, and was within my budget.
As far as I'm concerned, there is no need to think any further about my FZ-20 at this time. Perhaps one day digital photography will come to mean more to me and I'll be wanting something better, or something that will fill particularized needs that I might then have. For now, it does way more than I've even figured out how to use.
Same is true in the audio hobby. What people don't know normally doesn't hurt them one bit. Unless someone sticks around here and really starts to become a headphone hobbiest, there is no need to have more than one pair of headphones. Had I just dropped into Head-Fi and moved on with life, I'm sure I'd still be 100% satisfied with the sound of the HD600, which were the headphones that I already had when I joined here. They were (and still are) great. It's just now that I know what else is out there, I've gotten a little bit spoiled.
So to answer the question "yes" or "no" you will first need to define what you're looking for by hanging out here. If it's a quick fix to a problem that you have (i.e., need headphones for X purpose), then yes, one pair (any one of many) will do the trick and keep you happy. If you're wanting more so to learn and grow into the hobby and to experiment with different sound signatures, then no. In fact, there is no end to it until you define for yourself where that should be.