Unlike with Bitcoin it will be voluntary. Which is all the difference that matters.
Discussion
there are many ways to do offchain scaling and payment channels are one of the worst ways. they are a very specific type of plumbing that only makes sense in specific situations, that coincidentally are almost always involving some kind of custodian
I think that makes sense if you consider them as essential but a payment channel on monero is at worse just a communication channel between 2 people, we get the bad taste from Bitcoin because it's seen as an essential scaling or payments solution and you have to get on it even inside a custodian, but XMR on-chain works just fine so no one would ever get pushed onto using solely payment channel networks for payments