Well, this is old, but there are not that many topics, soo
Yes. It would be a bad idea.
It might be a good idea to be more independent of payment methods like paypal. Like accepting credit cards directly, instead of indirectly through paypal. That is, because paypal has arbitrary standards and is not neutral. (Though, I think the devs do can activate credit cards, but opt not to, because they are too expensive. Wich is somewhat disconcerning, because the very same credit card will be billed by paypal for many users. )
But indipendence shoud not be done via crypto. Morality and such things aside, it is the amount of money that prohibits this. Paying coffee money with crypto is just not doable. The transaction cost for small sums is just too high. Many times higher than the sum you want to pay. For bitcoin a few years ago this was in the vicinty of like 300 € for a single transaction in cost of energy due to needed computation power. Crypto means cryptography and de- and encrypting is not for free - it literally can't be, or it would not be crypto. Even if you cut this by factor 100 like Etherium or whatsitname claims, you still have like a few € for a transaction of ... a few € for a cheap indie game. Nope. Not gonna fly.
What might be possible is a wallet system. Microtransactions are just very bad, if you pay directy. Sending 1 buck or sending 100 bucks is the same amount of work. Of course there might be reasons not to have a wallet system, but I think it would be more practically than crypto by far.