To me the most interesting thing here is "Rolling UTXO set hashes". Bitcoin has a (theoretical future) scaling problem because the blockchain keeps growing forever without bound. No matter what you think about Moore's law, everyone knows it can't go on forever, so an infinitely large blockchain is not sustainable. With UTXO set hashes included in blocks, ancient blockchain history can be discarded on a rolling basis, turning the infinitely large blockchain into a fixed size rolling chain.

This doesn't solve the whole problem as the UTXO set itself also grows, but I suspect appropriate incentives could manage this problem (fees for increasing UTXO set size and/or bounties for reducing it).

With these problems solved, Bitcoin would theoretically be able to operate indefinitely without issue. Of course many practical scaling problems remain, the most important being the transaction rate cap.