Collada was sort of promising, but ultimately has the same issues as we see here with FBX - differing implementations and support for features of the spec, weird stuff, hard to support.
Ultimately I don’t think Blender dropping FBX dev or trying to use one of the newer Collada replacements is going to pan out - switching to a new format is usually the “go to” in this situation, and I’ve basically never seen it work out as planned. What usually happens is, the new format is just as or more annoying to deal with than the old one, and the whole cycle starts again.
Not saying I think FBX is perfect or don’t understand where Blender is coming from, but I just don’t see switching to yet another new experimental format is going to improve the situation at all.
As an aside, Unreal has one of the easiest to use art pipes I’ve ever personally used.
Edit: Well, not dropping support, but rather focusing on other formats.