They need to make the UI client sided first anyway. By the way, do we have an update on this SE?

Also I think 3rd party UI support (or UI addons, whatever you want to call that) would be a more intelligent move as for the long term.

Since they showed they don't have (yet?) the skills required to build a proper 2011 PC MMO UI, they could at least let the players do it by themselves, even if it's only to steal back the best ideas at the end.