It's cute that the handful of hardcore endgamers still playing think they're top of mind for Yoshida right now.

FFXIV needs to be in a state where they can generate revenue from it, if it is to have any future at all.

Most of an MMO's revenue comes from casual gamers.

Ergo, initial content may have some bonuses tucked in for the haijin (hidden bosses, etc.) but pretty much has to be tailored towards approachability so that the majority (the casuals) feel like they can actually set "worthwhile" (insofar as that term applies to an MMO) goals and attain them.

Given how little we really know about how the dungeons will be implemented, it's far too soon to say how a short lockout will impact for hardcore endgamers.

Once there is more variety of content, I would personally be in favor of longer lockouts and more rewards per run (see also: don't punish people with Salvage-esque drop rates), but given that these first two dungeons are basically a public beta for FFXIV instanced raids, I am not that worried yet.