Rates are set (in baht) by the Foreign Ministry, not by individual embassies, so, yes, it's coming. Will much higher rates have much of an impact for short-stay tourists? Probably not, but it might change long-term plans for some expats.
Also, if they change all visa applications to online ones, does that mean that one can only apply in one's home country? Travelling back home just to apply for another Thailand visa? - Yeah, right!