I can't see this being true anytime soon. They're all so movement heavy except Beth'Tilac, but even on her you will somehow have to control some of your toons on top of the web and some below.
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Still requires you to get a tank and a healer up there. Going into p2 @100% isn't very fun either.
Shannox looks next to impossible to box, i guess if you were way overgeared for the content it might not be too big of an issue.
Alysrazor....yea...stuff you have to click, flying in the air...
Lord Rhyolith...might not be that bad, but you have to dodge a lot of fire and coordinate dps pretty well.
Yeah i don't think many of them are multibox friendly...atleast not now
You'd 3-4 box DPS or 5box DPS in 25. I don't see people doing multiple roles yet, but geared ranged DPS should be doable.