Warmachine in particular is what comes to mind. They recently released a complete 3.0 version that rebalanced everything. Initially, they just released card packs for the different factions with the updated stats, but I fully understand that's not something FFG wants to do, but I think they'd be better off doing a variation of what they did shortly after that, releasing all the rules and cards online through an official app. I'd love to see FFG do this, and I really don't see a big downside for them - the casual community will keep proxying like they always have, but will be more satisfied with the accessibility. The competitive side will still have to have the original cards, they just won't need to get updated versions as they have them available on their phone. Additionally, now the competitive community will have an official squad building app that could make the whole process so much easier. Then just release reprints with the updated cards, and charge for the app, and you're good to go - I'd suggest doing it like Warmachine does with their app where you buy factions individually, rather than one large bulk purchase.
The other thing I REALLY want to see added is a version of the objectives system from Armada. This could solve so many balancing issues by allowing a variety of playstyles, while still having to tune your build to respond to different threats and different gameplay designs. This might also make support ships much more viable, which I would LOVE to see, honestly.