It's an interesting situation that you're in...
At the beginning of the year, B&H were selling the Hasselblad HV kit with hand-picked Sony Zeiss 24-70/2.8, waterproof hard case and beautiful Hasselblad-branded accessories. The price was very heavily discounted, working out to slightly less than the Sony A99 (on which it is based) + 24-70 + equivalent accessories here in the UK at the time. I knew that the camera was a Sony inside, but still I figured it may be the only opportunity I'd get to own a Hasselblad-branded camera that I'd actually use regularly.
Until I saw that camera advertised, I had no intention to buy a full-frame model - I'd decided that I was very happy with my K-3 and K-3II plus lenses; that they did everything I needed. But a Hasselblad... hmmm...
I had similar thoughts to you, but with an additional twist... The HV uses Sony's A-mount. Now, if you think Pentax has poor retail support, Sony A-mount is at least as bad, and possibly worse still. Plus, the money I was about to spend would have bought a nice Canikon full frame body and premium lens, with easy access to further compatible equipment and support in almost any city of any country worldwide. Then again, I knew that Pentax would be releasing the K-1 in a few short months, and since Pentax is where my "heart" is with photographic equipment, did I really want to buy into an entirely different system which would financially preclude me from getting a K-1? A good number of my lenses are full-frame compatible, so the K-1 was a no-brainer if I really wanted a full-frame camera. Lastly, the K-1 and Canikon bodies I could buy would have more recent sensors offering better resolution and low light performance... the HV came out in 2014, but was based on a 2012/2013 Sony model.
After much deliberation, practicality went out of the window and I followed my heart rather than my head. I wanted the Hasselblad, regardless of the lack of retail support, the smaller choice of new and legacy lenses, older technology, even the smirks of the photography community who had ridiculed Hasselblad's re-clothing and re-badging of Sony cameras. I didn't care, I really wanted that camera. So, I bought it, it felt good, and I'm absolutely delighted with it. Buying lenses has been a bit of a pain, it's true, but it's a fantastic system and I get a huge amount of enjoyment shooting with it. I can't ask for more than that.
If you're a hobbyist / enthusiast rather than professional photographer, that's what I think you should do too - go for the camera you most want; the one that will make you feel good when using it. If that's a Nikon, Canon or whatever else, so be it. You don't have to be wedded to Pentax. But if you really want the K-1 - and I suspect you do - then don't worry about the lack of retail support... you'll work around it, and it'll be worth it if the camera you shoot with puts a smile on your face