Sounds rather esoteric. What would your idea of a fairy type be?
Eldritch, mysterious, and/or cute.
We have dedicated ghost and dragon types, so fairy seems like a natural fit as it encompasses a fair number of mythological concepts: everything from sidhe of Ireland to youkai of Japanese folklore to the nymphs of Greek myths.
Honestly, Fairy would be far from my first choice (Although I hardly have any better ideas...), but I wouldn't mind a new type.
After all these years, I'd like to see them throw caution to the wind and mix things up a little. A new type is interesting; it's something they haven't done in many years, and it gives us veterans a whole new factor to consider and explore. It's been a long, long time since anyone has felt the thrill of testing out a whole new type.
Maybe a new type would prove to be a bad idea, nobody can really say for sure. But hey, if it does happen, I really doubt it will ruin the game; I'd be excited to try out any new type, no matter how stupid its name/concept sounds.
And if it doesn't happen, we'll get another new installment with the type chart that has seen 4 excellent generations. Either way, I'll be happy :)
I summoned a baby to attract a lion. It didn't seem to work, so I tried a delicious baby. Regular baby ATE delicious baby. Horror....horror.~Gameplayingperson