Blender will be dropping support for COLLADA soon, citing lack of OpenCollada maintenance as a compatibility and security concern. Several tools only export to COLLADA, and the Models Resource community currently only accepts models in .obj or COLLADA format.
I want to save this format. I think it should be updated, not abandoned. Please, if anyone at Cronos Group has any interest in updating and maintaining OpenCollada again, I’ll learn C++ and update it myself if I have to. If the problem is that the format is outdated or obsolete, update the specifications to 1.6. It could support more effect profiles and shader languages, like slang or OSL. It could make multiple UVs easier to work with. It could have all the features and functionality of glTF.