Yes, it can never go to zero in value. I would rather say, it can't even touch 5000$ due to interest of people in bitcoins. One thing we all should realize by now that bitcoin is the future money so no matter what FUD is spreading and destroying the price, it will eventually rise back and will reach its top again.
It is true. Big investors will definitely do something before that happens. Opportunities that are smaller when some countries begin to have the discourse to have its own cryptocurrency. That is, cryptocurrency is accepted.