"""
If Debian will evolve like modern "democratic" parties...
"""
I think "evolves like a daytime drama" might be a better analogy. This situation is perennial, par for the course, and not anywhere near as bad as it sometimes gets. This time in the next release cycle, a slightly different cast of characters, some old, some new, will be struggling with pretty much the same issues, or very similar ones. My impression is that Debian is at least as much about people as it is about software.
Somehow, in the process, they still manage to create a great distro core to piggyback on, even if they can't stop bickering long enough to actually get a release out of their own.