Then somebody who has an existing project adopts this to manage the ubuntu version while maintaining contact with an existing project repo.... A few more people do likewise an repeat all of the above with:
And so on. Then a few Fedora folk pick up on it and repeat all of the above replacing ubuntu with fedora.... then debian, suse, etc. Bug fixes and improvements to base templates will start failing to make it into the more obscure variants and everything blows up.
The word for this is combinational explosion and the solution is to realize what is going to happen and break the template into pieces now and have the project sane default along with user local preferences for things like editors, default UI toolkit for new projects, etc.