I should think a larger LCD would be an advantage, even if it is "just" a synth (unless you use software patch editor), and no workstation. I think the XP-60/80 has a great interface that lets you see what you are doing when you edit sounds.
In my opinion, Roland would be crazy if they developed a 61-key XV without including sequencer and bigger LCD. I can understand that a lot of "piano-people" like the XV-88, but for the rest of us, I think it would be more interesting with an upgraded version of the XP-60 and 80. (Not that these need to be upgaded yet, considering the competition)
Besides, I see the XVs more as evolotion than revolution over the existing XP/JV-series. For example; check out the effects-section. A few more and better algorithms, but same number of processors.
And yes, there are some people that use built-in sequencer.. We even use our workstations as "musical instruments", playing the black and white buttons and everything.... :-)
I just don't need 88-keys, and having grown up with electronic keyboards, I hate "piano action and feel" !!
Stig