When it comes to WOTC putting 3.x under CC, I suspect they just don't care all that much about older editions. Unlike 5E, there are no big fish that are making millions on the older rules. I also see no reason to think they'd change the OGL for older versions because of the blowback they already received. It was a stupid move with no benefit, I doubt they'll make the same mistake a second time.
As far as otherwise going beyond what they've already done, why would they? The vast, vast majority of people that play the game have never heard of the OGL issue. Releasing a few PDFs here and there (or whatever) is not going to change any minds anyway. There are people that, like Lucy with Charlie Brown's football that will never give their support now no matter what they do.
The publishers are the ones that really matter and it seems like they are starting to offer more marketing options than ever before by allowing the biggest players the option to put their product on DDB. They seem to be backing up their claims that they are the stewards of the hobby, even if it is a slow process.
If WOTC puts out a product I think I will enjoy I will consider a purchase. But trust? Nah. I reserve trust for people I know and care about, who have proven themselves trustworthy. I'm not going to trust a company who's primary goal is to make a profit, which means I don't trust any of them. They simply don't care about my individual desires and needs, they can't.