A war and a US post-colonial puppet regime would be a bad scenario for South America. I heard the Venezuelan army is rather well paid, so, if it's true, an overthrow wouldn't be clean at all, but the contrary, rather bloody, and I don't envision Colombia really wanting a long conflict at their vicinity.
In a better timeline Brazil could be already leading the continent towards bigger things. I've wondered about what role in Foreign Affairs a radical right wing presidency in Brazil could took. Rather bleak and depressing prospect, I think.