But even with Congestion Control there would still be a time-limit for lots of tx: one per pool tx that has at least one unspent vTXO. They are smaller than unrolling everything, but there are still ~500k 5-second periods in 4 weeks. Or could they be batched in some way?

Do you believe Ark+LN can realisticly put a sat in every hand?

How would mempool fare if a large ASP goes under and all vTXOs need to get on-chain? Is there always enough time to start unrolling your tx with/without CTV congestion control?