There are already silent payments.
Discussion
when a fully functioning drivechain-style L2 provides the same level of privacy as monero at an affordable price to a large number of concurrent users, you are welcome to come back again and try to convince us to stop using altcoins
Alright
Silent Payments is such a meager improvement.
They don't hide your transactions from the blockchain at all. And the counter party can naively figure out which address they actually sent to. The sync time is also abysmal compared to Monero.