Yeah, I share that dream. I guess
@Reika's mods are a nightmare to port, but I do miss them in the 1.10.2 pack I'm currently playing, and I also miss TC. I'll be playing different versions for the time being - the new stuff available for 1.10+ has an attraction of its own, but the amount of content for 1.7.10 is unsurpassed and will probably remain that way for some time.
But yes, I definitely dream of having all the good stuff together for one version again. As I see, some modders have taken up multi-version development. I wonder how difficult that is.