As far as PS3 worries go, I wouldn't worry about it. Text size was scaled up on the 360's XI due to beta feedback, so I'd imagine if it became an issue in the PS3 for XIV beta they would fix it.
As for PC, yeah. There needs to be an option for the text to be scaled up for 1080p. I say option rather than an automatic scale because those with 1080p monitors probably won't have as much of an issue with reading since it's right there, so why force them to have larger text?