@mahler123 ...Personally I am not going to spend thousands of dollars on something if I think the company may not be here in 6 months. YMMV. However I think this space should be a legitimate place to ask questions.
There is no guarantee or reasonable answer. The small boutique companies can be challenged when the hands-on engaged owner gets sick, or has parts supply challenges, or just stops supporting a particular model any more.
The mid-size companies can get bought out, and who knows what happens next to products, parts supplies, and whether they’ll continue to repair something or not.
Larger and known COs get bought out too, Bose-McIntosh, maybe more promising here, we’ll all watch and see what happens with models, parts, ongoing support?
One other member and I here talk about this question quite a bit. One other factor is whether or not we could get something repaired locally or not with a good tech. I had some amps a while back that I really liked for my speakers. I even had two spares of the same amp liking it so much. One day the main board went bad, tried fixing it five times. Boards aged, hot, cracked, multiple repairs made. Local 50 year tech buddy gave up, and I sold it for parts. Then let the other amps go too for someone braver than I am keeping amps and gear around with limited spares out there with low-volume produced boutique amps.
I tend to think it’s a roll of the dice no matter what you buy out there. Can you get it fixed later, that’s the question I’d have first and foremost. Good Luck.