I believe I recall Adam Back discussing some sort of Roll Ups as well but I can't remember the context. I guess that's my point with L1 and 2 scaling. Bitcoin is dynamic. L1 will scale dynamically, L2 as well. L1 scaled with Segwit. Lightning is scaling with embeded mobile nodes. Who knows, maybe lightning can onboard easily and self custodially with enough work (I don't think so because it requires channel management and again, this is my biggest critique of lightning). All this makes me excited for other solutions being proposed. Bitvm being one of the newest but also things like ARK. But to say Mainnet and Lightning "can't" scale in certain ways lacks an understanding that these protocols are actively changingand being worked on daily to do just that. These things will scale naturally as demand presents itself. Before 2016, exchanges didn't batch utxos. Now they do. Before last year, they didn't use lightning. Now they do. That's L1 and L2 scaling in response to natural free market incentives.