is bitcoin going to go down to $0.00USD?
is bitcoin going to literally tank and go down to zero?
if bitcoin goes down to $0, is that the end of it? or could it come back after that?
if bitcoin goes down to $0 will there be other coins that rise up in it's place?
how far down are you thinking this bear run will take bitcoin? $1,000? 500? Less?
what is your opinions?

Whatever price it does end up at, it will not become completely worthless. There is much more development within the space now more so than at any other point in the last ten years.