Nah, that's a boring ass way to change the game. Adding new mechanics is much better. Relearning where shit is, is just tedious and boring. Learning to strategize vs new mechanics and obstacles is exciting and refreshing.
The whole reason boxing is an issue is because the game is mind numbingly simple. Classes, especially melee, need to be given new abilities and things to do. A good example is what Shards of Dalaya did with monks by making is so that using styles in different orders you produced different effects like debuffs etc. If classes were more complex and engaging, boxing wouldn't be so easy. Mobs can be given anti caster mechanics where you need to position behind them or they'll reflect/absorb your spells so that casters can't always just stand still and brainlessly hit the same buttons over and over again. There's lots of relatively simple things that can be done to make the game far better.