Reversible or not it would be a tough decision whether to change the face of the Pokémon franchise or not. I mean Pikachu is STILL the most popular Pokémon globally so if you changed the face of the franchise's most popular Pokémon you'd lose support from groups like old gen fans to little kids in third world countries. Everyone who likes Pokémon, but cares about the content of the vidjagames half as much as you would be like, "WTF did they do to Pikachu!!??"
and this
>>14215420pic unrelated