Considering that Final Fantasy X, Final Fantasy XII, Front Mission 3, and Kingdom Hearts all fit neatly onto single-layer DVDs, I'm sure they're fine with what they have.
Actually, from what I understand, they're upset with Sony for not including a standard hard drive on the PS3.
FF XI shipped with a HDD and we don't know if contents were timmed from FM4 and KH2, like many current games, to fit a single layer DVD.