Why would they do that? On it's own "Internet" may not seem to be an important category, but I am willing to give apps many more permissions if I know that they can't phone home. For tools, the Internet permission is often the deciding factor for me.
I'm not sure if Google would go for it, but I suppose it would encourage devs to use Play services for ads and analytics, since it wouldn't need any extra internet permissions, while using an external service for either would.
[1] http://arstechnica.com/information-technology/2015/03/a-revi...
Also, I think analytics should be something fundamentaly optionnal, at least from a privacy POV.
There is, but there are multiple crash reporting services that provide more features than Google (and just having some competition in that area is pretty great).
In my company, we use Crashlytics on Android & iOS and Bugsense on wp.
As for Internet, they leave that out of their "improved" Play store permissions as well (and the M groupings seems like a carbon copy).