I expected this to be the best generation so far, and I think it's safe to say I'm right
I don't know I think their is a big difference between form changes and mega evolutions.
I'm not sure but it seems that each pokemon form either keeps that stats the same or redistribute them ( for instance taking away from attack to give to special attack) but it seems mega evolutions will just increase the pokemons base stats just like a normal evolution
Also there seems to be some bonding requirements in order to use the evolutions so this is something similar to how enough exp will allow a pokemon to evolve. Now with form changes besides maybe a move and the obiviouse item or object their are no other requirements to change forms
I think we should respect Game Freak and call them what they are megaevolution .
I think calling them form changes is the same as calling form changes evolutions