It can't go parabolic forever. Once it starts hitting certain valuation, other coins such as litecoin will become more popular as they'll be more affordable to the average user.

If people just hodl bitcoin and don't actually use it then I think it will lose out in long run in popularity and the price will come back down. Do I think bitcoin price will rise, yes. Do I think we'll ever see multiple million dollar bitcoin, no.

Don't get me wrong I'd be ecstatic if that happened, but there will eventually come a point where it's not worth it and no one is willing to pay that much.