sennheiser is not a company that drops its prices due to competition. hd800 price will not fall bc of a he1k.
sure, i think business-wise it makes sense to have lower profit margins and sell more bulk... you will make more total money that way. look at the beats pricing strategy. that is the consuner sweet spot at $300. anymore, they are asking why does headphones cost more than a laptop or smartphone or nice tv.
so the problem for the he1k will be demand. there really isnt that much demand for uber highend headphones in the $1.5+.
another problem is that their target audience tends to judge quality by msrp. if i was hifiman i wld definitely charge higher than the competition. my personal experience with the he1k showed me that they are a clear step up over current flagships, and shld be priced accordingly. now i do think that most flagships currently are severely overpriced atm, but hey... that has nothing to do with hifiman. they generally always price below their competitors and offer a better sound quality at a lower price.
however, their direct competitors such as Oppo & Audeze has clearly shown that consumers buy even at a significantly higher price point (for the similar or worse sound quality) if you just add some premium materials & luxurious design. I personally think all Audeze headphones are priced much higher than what I would guess based on sound quality only, but it works & Audeze has shown there is an interest for $2k headphones.
I have done a lot of direct blinded comparisons between $2k, $1.5k, $1k, and slightly sub-$1k headphones... besides the difference in sound signature, there really no real large sound quality differences between in in terms of technical performance. Yet people on the forums do generally proclaim the more expensive models being better and etc.
Now when you hear the HE1k, which actually does provide more performance & sound technically better than the current flagships... there is really only one way I personally think they should price it for it to match the current market. But really more the fault of consumers for feeding the market & purchasing all these pricier gear with minimal sonic improvements that leads to this state (imo). Companies get away with releasing things at higher price points or widely variable price points with minimal dramatic improvements, so now that something with actually a drastic noticeable improvement comes along... well, it is what it is.
*personal opinion of course from my personal experience*