Though I think the sketcher improvements that have gone into 0.22 (and aren't in RealThunder's work) are absolutely more valuable, and I'd rather see the facilities you mention reimplemented on top of those.
I'm not convinced by the automatic subshape binder bit; I think that is better handled explicitly.
Maybe we will see something that formalises the master sketch workflow, but I don't think it is particularly universal as a design technique. To me it seems it would maybe be better to see some kind of improvement to the selection mechanism for importing geometry from other sketches. I find that a little opaque.
I would like the built-in part design wrapper facility. And I think there are improvements in the cross-section view; I think Persistent Section Cut is often more hassle than it is worth.
As interesting as the RealThunder branch is, it's one guy's fork of experiments, and he didn't have to get agreement from anyone else or follow anyone's coding standards but his own. And for better or worse that fork is now (edit: likely) a dead end, and all the energy (edit: and money) is elsewhere.
Some great stuff has come from that branch but I don't think there's any reason why it should just be automatically blessed.