In the future, if more well-known personalities will going to support bitcoin and other cryptocurrencies, the adoption might going to speed up because this will attract more people to use bitcoin.
This can never be a good thing. From what we have seen so far, almost every non crypto related public figure that entered this space promotes blockchain in general, and a shit ton of alts that don't add anything of value to our system. The last thing we need is more of this garbage adoption, because the more of this we have, the less relevance the decentralized nature of this space enjoys.
It's mind boggling how people can be so confident about a specific altcoin, while we know for sure that it will fail eventually. The faith that these people have in altcoins comes from these clown-ish public figures, and they are mostly heavily biased too, either because they have been paid to promote them, or they are balls deep in the coins themselves.
All I hear about nowadays is blockchain this blockchain that. It's rubbish. The blockchain is worthless if it isn't utilized to protect the network in a decentralized way.