The takeaway from this is the phrase 'legacy desktop.' When you hear somebody put 'legacy' in front of a tech you depend on, don't be suprised when they hose you. So if you aren't planning to be on tablets or some other vapor in the next couple of years you should be planning a migration from Ubuntu. Because if you don't, WHEN (not if) you find yourself abandoned you won't get any sympathy from anyone with a clue who read the writing on the wall. Some would say Unity is already an abandonment of the desktop, which isn't far from the truth. Same goes for GNOME Shell.
Don't think we have ever seen lemming like bahaviour as bad as this. Abandoning all development on the desktop when it still has overwhelming market share and there is currently zero hardware available for running this future touch interface of the future on and pretty close to zero on the horizon. If ya really think touch is the future it certainly makes sense to be designing to work with it, but to just toss everything on some leap of faith that "If we build it, the hardware will come.. and the users will actually want it." makes no sense to me.
So now is the time to be investigating alternatives. Walk, don't run toward the exit. There is still time to get out in an orderly fashion since there are still supported releases that are usable on a desktop. The trick is to not wait too long.