I think it would need to be a bigger change.
I like 5e. At the same time, the things I would like to see changed so-as to bring the contemporay D&D experience in line with what I want would involve changing aspects of the edition that are central to how it is currently built.
For example, I want the concepts of Backgrounds to be explored more (and more like how they were during the 5e Playtest and in the PHB). Instead, it appears that 5.1 is moving away from that, in favor of making Backgrounds anther vehicle for feats.
I actually would like more opportunities to select feats, but I want that to be a part of the normal progression. Yeah, I know many people don't like feats. I understand why, but the game is also trying to sell me on lists of feats while giving me very little opportunity to pick any of them. If feats are meant to be a part of building my character, give me more opportunities to select them as I progress (but not from backgrounds; backgrounds should be something different).
I would also like to have a better understanding of why certain choices are being made for 5.1. I'll admit that I'm older now, so I'm likely not the target audience for the game anymore. However, I often get the impression that the people designing the game aren't actually playing the game they're selling. It's cool to have houserules and do things differently, but I don't fully understand what the mindset is behind some of the errata, changes to how the game works, and so forth; I think part of that is because I'm not seeing eye-to-eye with how the people selling me the product intend me to use the product.
Sometimes, I feel like I'm standing at the checkout of Home Depot and the cashier is trying to convince me that I should spackle the same way that I caulk because there's a new set of screwdrivers in aisle four.
I'm struggling to understand the direction of the product or why I'm being told to use it in a particular way.