And 1. the more the downtrend continues 2. and/or something in the world changes to spur adoption, the demand will not increase, and the price will not increase. Isn't it?
Yep, but we can't know that either.

if i follow your logic then, bitcorn will soon be 10 usd, hashrate will plummet to just few giga because there is no incentives to mining and its all over for bitcorn mining industry... ppl who mining will do it for fun (and use pc and smartphones) and will not sell anyway. it will be the worst scenario and ultimate test to bitcorn existence.
even then i still believe that bitcorn can endure such disaster and survive
even then i still believe that bitcorn can endure such disaster and survive
No, previous performance don't prove same will happen in the future. Because bitcoin went up in price for 5 years doesn't mean it will keep doing the same for the next 5. But because it went down for 1 year doesn't mean it will keep going down to $0.
I'm just saying bitcoin and bitcoin mining is about offer and demand, and we can't know what will happen.
If you think price will go up you can freely buy bitcoin and hold to profit in case you're right, or lose money in case you're wrong. It is just a bet.
And bitcoin "surviving" is another thing. It could survive below $1 with some people mining. But we are not speaking about that, we are speaking about making profit with bitcoin.
If price goes down to $10, 99% of the current bitcoiners would forget it.
Most of the people is here for the dream of winning a lot of money and being part of something big. That dream would be nearly over if price goes back to that price.