Right....:sy:Pro Uchiha are Uchiha who do not need Senju DNA like Itachi.
If Sasuke would get rinnegan, then it wouldn't be like Sasuke's character to do that, although there always is a possibility he will get it. Just doesn't seem like it
The Rinnegan is unlocked unwillingly. Due to the lack of knowledge arround it, ninja can't just pick and chose. Madara didn't even expect it. If you can, it will happen at some point.