I used to think there were two ways of scaling Bitcoin: one would be with trusted entities, i.e. banks, but deployed in a decentralized way that limited liability and government capture, and the other way was with Drivechain. Given what we're seeing with all the Lightning custodial wallets being ta...

Monero has active sidechains (p2pool) and merge mining (Tari, others soon to come). If drivechain scales Bitcoin, it can also scale Monero in virtually the exact same manner.

I think you are married to hashrate escrows or perhaps the airdrop you'll be getting next month. I will also be collecting this airdrop... BCH has enough expressiveness already that they could build a two way peg, without doing hashrate escrows. BTC doesn't need hashrate escrows to get good sidechai...

Look into Tachyon for Zcash

The probability of Monero having bilion of transactions is close to zero. Nunca vai acontecer. We'll just keep having multiple ways to locally send money and settle things on Monero for large values as done already today.