I think also that real Bitcoin enthusiasts will only really massively migrate to sidechains with the same enthusiasm like some show for LN when their native token distribution becomes decentralized, e.g. done via PoW. That seems to be currently a major hurdle - all operational sidechains I've seen, either on Ethereum (where rollups already are quite popular) or on Bitcoin, are either federated or work with a highly centralized native token. This means that in general the operators, or a small group of large investors, have control if something fails - and they could also probably scam the participants if they wanted to.
It's possible that the reason for that are simply economic incentives (operating any centralized altcoin makes it much easier to earn money for the devs). But it's also possible that the technical obstacles for secure sidechains with 2-way pegs, which have been extensively discussed for example at Paul Sztorc's website, are still valid - and thus it's possible that a decentralized sidechain is highly likely to fail.
We could however start an experiment: Simply create a fork of Nomic, which is PoS (Cosmos/Tendermint-based). But instead of distributing it per ICO, do it according to a snapshot of a PoW altcoin (either one that already exists, or a new altcoin created). We'd have a sidechain which would be the most decentralized on the market
PS: Just a little addition: Those with doubts about that project seem to have a point. The token distribution seems to have been quite shady - red flag, as I already wrote. I fear this may not be a serious project at all.