I feel like the the original dream of using crypto as an alternative to cash is mostly dead for the time being (for various reasons) and therefore holding and then cashing out into real world currency is what's boosting prices for the moment. Dogecoin is a good example of speculation as it doesn't have a massive use or application, besides being a meme coin that was easily accessible and cheap.

I was reading on hacker news about the creator of Coinbase's original idea of undercutting credit card fees, but in the end look what happened.

So I feel like speculation about cryptocurrency is difficult if not impossible, it could be worth nothing or could be worth multiples in the future. I don't think anyone knows for sure as it follows its evolution.