Bitcoin's prospects are bleak. I don't believe it will die or crash to zero. But it wont be able to compete with alt coins. For example Ripple is basically just a better version of the lightning network out of the box. Ripple is a cheaper entry point, its centralized in the same ways that the lightning network will be.

Bitcoin is already dead in terms of its ability to profit from HODL mentality. You wont be able to have gains that compete with literally any other coin. The only people who make money from BTC right now is day trading. Most people will only lose money from BTC at this point.

edit : Self upvote for visibility.