I think it will only affect ITG monsters, so exp will probably remain intact. However like it said, look for the Diabolos and Bahamut fights to be a little tougher. Also it'll probably be applied to sky gods so linkshells don't just use cheap tactics to kill (chi blasting, majin, etc). I've always waited for them to change the game to take out the cheap tactics... I'd rather kill something straight up then kite it around while unloading on it... seems cheap and not really worth the effort to me. But then again what the fuck do I know right?
I agree...we've done some tough fights with atypical setups...fights that 'require' BLMs to sleep/nuke/repeat, we've done much differently and succeeded...and I've had a greater sense of accomplishment from that.
anyway, back to work since technically, I'm too busy this week to be on the net.