Your Devotion attribute reminds me a lot of what 5e did in the DMG with examples of Sanity and Honor. I think you could very likely see something close to that, at the very least, used optionally in future editions.
Law and Chaos are foundational in my campaign. It is a critical piece of my world building. And while I am sure I will monkey around with whatever edition comes next, alignment will play a central role even if not specifically given rules in the game.
If we are doing predictions, I still think alignment makes an appearance in whatever they have planned for us in the next year and a half. As mentioned above, likely as a optional rule padded with useless fluff to avoid upsetting the upsettable.