Not him, but there is progress in the Ethereum ecosystem on multiple fronts (in a way that's lacking in Bitcoin), so following that progress seems viable. There are working ERC-20-compatible layer 2 low-fee/instant transfer systems on Ethereum that Brave could use, and Ethereum does have plans being developed for sharding layer 1 transactions which will reduce fees for normal transactions.

(Disclaimer: I'm a bit biased toward Ethereum. I think it's more meaningfully decentralized and I own some eth.)