I think MF and GF is great but actual base stats increase? I'm not sure I agree with that. This has turned from being a pure grinding bonus to a core change to the game's leveling system.
I do not think it is a bad idea at all.
100 levels. It is around 200+ on your main stat with levelup and 200-300 vitality as well.
A lv100 paragon lv60 will have 10k more hp and will stay at 2-3000 dps higher.
It is not going to be upping the character level, if you are thinking about that. Every skill, I assume, will still operate under the assumption that you are lv60.