Yes, I have these assumptions as well. Python microreleases (3.4.microrelease) are bugfix only and upstream takes care to not break anything by them. BTW we do these updates in Fedora as well without actually rebuilding all depending packages, we just rely on upstream to do a good job maintaining stability - so far, they always did.
Well, I believe that the simplification is that people will be, initially, able to import their specs from Fedora with very few changes.
Just BTW, I talked with Dennis Gilmore during DevConf and he said he's ok with putting the %python3_pkgversion_nodots and %python3_other_pkgversion_nodots macros into minimal buildroot in both Fedora and EPEL (Fedora will actually only have the first one), so this will provide additional simplification compared to my proposal for both packagers and for those during mass rebuild for new python3X+1. Also, I think I'll just strip the "_nodots" from macro names to make them look less awful :)
Slavek