When will you start accepting Solana?
They were asked about adding Solana to the platform last year, and this was their response. Perhaps they are first waiting for the hype to die down.
It is possible that Solana and some more popular currencies will be added, but we will await till the end of some hype trends first, because currently it's hard to tell whether Solana's popularity increase is natural or made up, but of course Visa's adoption is a serious step for it (but let's see if they don't change their mind?). We are also awaiting for more audits in regards to their code and network decentralization.