The grossly oversimplified answer... as long as a not-insignificant amount of people keep believing in its value as we approach the 21 million cap - it will continue to rise quite significantly. Simple supply and demand.

It could have literally zero utility whatsoever - as long as people keep buying the hype that this will one day be a massive store of value - it will be a massive store of value.

The better answer ...no one knows anything. 100% unadulterated speculation.