If price goes to bottom then people who are true believer of bitcoin will buy bitcoins in bulk which will again boost the price and regain its position again in future.
Definitely, I believe it's established enough where it can never hit 0 unless digital communication/blockchain communications get blocked somehow.
Yeah bitcoin will never fall to zero level, unless its holding some price there is always an opportunity for to bounce back again, so in that case it will be good to put some more money in buying bitcoins.