I'm not going to pretend to have the slightest clue how it pans out until there are a few actually up and running.
You imagine that people will stand around doing nothing to change their behavior as LN nodes become centralized. But if decentralization is worth anything then that is precisely what will not happen.
Whisper it, but most people would choose convenience over decentralisation most days of the week. Look at Coinbase.
Yes, exactly. And then look at all the alternatives. I'm not saying there won't be an unequal distribution of channels. I expect the efficient and good LN operators to dominate. But just as there are many smaller exchanges catering to people who have reason to reject or look beyond Coinbase, there will be alternatives to using major LN channels. We (as a community) just need to make sure the protocol is not co-opted to raise barriers to entry in handling Bitcoin TX, such as when miners try to prevent off-chain TX.