It would be
terrifying. I mean, considering all the damage Yoda caused when he was being
good can you even imagine how much damage he would inflict on the galaxy when
he was actively trying to fuck shit up? He would wreck the galaxy worse than
Palpatine LOLSeriously,
it’s hard to imagine how much worse he could make things when he already (unintentionally)
made things pretty bad in canon. Also, it’s hard to imagine what would make
someone as detached as Yoda to forsake everything and change sides.