The sad thing that I've noticed is that, there are still plenty of users with those custodial wallets and they're trusting it more than the non-custodial. I think the ratio compared to us that knew the differences of those isn't that big.
Maybe my use of the word "trend" is an overstatement. Still, from a couple of years ago when basically everybody (ok, don't take it ad-literam) had their coins at exchanges and other custodian wallets, the things are changing. Of course, some are lazy, careless or incapable to take care of their money (after all, it does require a bit of skill) and they still have their coins in others' hands.
But the charts about the funds leaving exchanges or the charts on how many hardware wallets are being bought do show a direction I like. We cannot expect wonders overnight, but the direction is good.
But still, we'll never know what can happen to those funds if something goes wrong with those wallets or services that these people are trusting. Especially these days, it seems becoming common to see exchanges halting withdrawals and it's possible to happen with these custodial wallets.
True, there are plenty of topics on this matter here on bitcointalk. And if not all the people from the forum read/care/comply, then what could we expect from the outsiders?!