Riot learning their lesson about bad decisions? Wtf world are you living in?
In all seriousness... it would be a good change, if like you said it didn't pigeonhole him into jungle only. Nunu top, mid, and/or support could be a thing, without being cancerous, if they'd put a little more thought into his kit... gave him appropriate buffs (not ones that come with nerfs), rather than a minigame he's required to play in order to remain viable in any given match.
The buff, while likely not finished, could add a lot to his gameplay... not sure if it's going to have unlimited stacks or what. But seems like after a while it will get to be a bit much, even with the potential downside of it. Making it a good change overall... but for the jungle, only.
But why give the community what they actually want (laning nunu, among many other things), when rito can simply give us what they want us to want...