The problem with the lightning network is that it's still not easy to use for newbies and not many wallets support it.
i disagree - what is hard in installing an app? there is bluewallet, phoenix, walletofsatoshi and so on. sure some are more custodial than others, but i would argue that it is getting easier "every day"
maybe there will not be a lot of usage in the store, because it is obvious that you spend the "dirty fiat" first, before spending valuable sats. but then i heard there are also people having only bitcoin - they have to spend their sats one way or another