Don't they contribute little to begin with anyway? I remember there was a bit of mudslinging last year and the hot topic was that Microsoft contributed more code to Linux than Canonical did. While I think they've done great things for the overall landscape - I don't particularly like the direction they've been going since Unity. I'm not saying that it's the wrong thing for everyone everywhere. What I don't like, in particular, is that it feels like they're closing off something that wasn't meant to be. Unfortunate as it is, I hope they continue to remain viable - as they are a stepping stone off of the Microsoft and Apple platforms.
The moment Ubuntu becomes unviable either because of their own doing or because other people in the linux community want to throw a fit and have a pissing contest is the moment I switch to Mac OS.
It's not that great.
There are plenty of other distros that are just as good.
And there is the problem, I don't want to try out a 100 different distros.
You have limited yourself to the arbitrary limit of 99 distros before giving up. I'm sure you'll find a good one among the top 99 on distrowatch.com.