Just a quick comment, but flipping the camera angle wouldn't fix the problem, but instead introduce new ones, like having a completely different perspective of the map altogether, and not being able to properly see objects in the map.
First, most developers don't put skins on the parts of an object you don't see (even first person gun models). Whether or not that is true of LoL I don't know.
Second, the map would have to be redesigned, because you wouldn't be seeing everything in the way it was supposed to be seen. The shops would be backwards, trees and bushes are awkwardly placed, etc.
Third, now you have an odd feature in a map that is unnecessary in other maps. It gets very messy this way.
The only option as I see it is for Riot to completely remake the map in the style of Twisted Treeline, where the bases are on each left-right side instead of each corner. Quite a bit of work to do there, as it isn't simply a matter of rotating the map and it is already designed to be the way it is.
You are really better off waiting for the new map and hoping it will be in the left-right style and not corners.