Some of them have already started accepting bitcoin, in future other established altcoins will also be accepted such as Ethereum, Litecoin, and Neo.
Crypto currency be accepted in the future (2025)? That's everyone hope's, as of today, some are now accepting Crypto currency and some following little by little as it address issues on Regulation on the said project. Crypto currency investor will be happy if this will be accepted globally. No FIAT transaction.