Let's pretend that the player base does deserve it... the development team would can the project before it got off the ground because those diehard 2D people would whine and fuss that it doesn't "look like UO."
Eh? So you reckon EA decided that a possible multi-million dollar payoff from a really succesful new MMORPG - which a 3d UO pretty much would be, in marketing terms - was not worth doing because a couple of hundred at most posters on a forum said they'd quit if they went ahead with it? You think the 'dev team' cancel projects if EA think there is a profit to be made?
You really think business works like that? Or that what people rant on a forum only game-fans know about really has such an impact on big-budget ideas?
Whan they look at a big redesign, they measure the likely new market it will bring in. If that looks like making a load more cash than the existing market, they do it. If they doubt it will make them money, they don't. Fanboys screaming 'I'll quit' on a forum have absolutely NO effect on the business side of EA. We can influence in-game design, patches that might be needed, give good ideas to the dev team - but we have zero impact on the soulless accountants who weigh up likely profit and decide to invest or not.
KR, SA, 3d, Dragon Age style,or any other client 'upgrade' gets made if there's big enough profit assessed likely from making it. It's canned when the bean-counters think the profits of making and marketing it will not give a big enough return on the cost. Decisions are not affected because a few hundred existing subscribers out of several tens of thousands yell 'I'll sulk if you do it'.
Nice as it is for the ego of a few posters on pretty small (in EA marketing terms) forums to think they can sway a corporate like EA in business decisions, it's frankly deluded to believe so.