The only question that I ask is: do the Western powers need a system of divide and rule in Cyprus in order to guarantee the existence of the bases and military facilities? If not, then unification remains a feasible long-term project.
Unfortunately with Cypriots being divided it is indeed much easier for them to control Cyprus. The Cyprus problem is used against both sides (Cyprus - Turkey) as both a stick and a carrot. If Cypriots were
truly united and Turkey didn't have an interest in Cyprus anymore, then it would be more difficult for USA/UK to do whatever they feel like without even being questioned. And in the mid to long term future, if the unity of Cypriots would be solidified and EU became closer to a confederation and more aggressive in perusing her own interests, then I think it would be very possible for the UK/USA bases in Cyprus to be turned into EU bases with much better terms for Cypriots.
Basically the reason why the current balance of power will not allow a true united Cyprus is the same reason that a clean partition will not be allowed either. Not because they are making as a favor or because they care about international law, but simply because such development would not suit them for mostly the same reasons.
P.S. I emphasized the
true when I was referring to unification above, just to distinguish it from the pretend unification that was the Annan plan. That plan not only would not unite Cypriots, but it would turn the illegal partition of today into a legal one with two separate and conflicting
states this time, instead of just ethnic groups. At the same time, as opposed to a "clean" partition and the current status, no side would have a real country to fight for the rights of the Cypriot people in the UN, EU etc. We would be reduced to a community, and the "central government" would be unable to take any important decisions, leaving the most important issues to be decided by the supreme court, which would be made up by foreign judges, and you can guess who will actually appoint those and whose interests they would serve.