I think you are deliberately missing the point.
It doesn't matter how much Turkey genuinely wants to join the EU or not .... it probably does not know itself ... but it knows enough that it has figured that it is important to continue a flow and an exchange, with a view to joining. This way it keeps itself tied enough to the EU, that the EU will not turn round and throw it out of Cyprus and upset the apple-cart for negotiations.
So as I say ... when it finally is severed from all EU ties ... then we will get somewhere! And that is just a moment away .....
You are right, I did miss your point, though not deliberately, only because the thought of the EU cutting all ties with Turkey is so wild it just never entered my head.
Turkey already has a trade agreement with the EU, it has important oil pipelines to the EU going through the country, it is an important NATO country on the southern flank of Europe, it contributes to UN peacekeeping forces and is currently a member of the UN security council, and it is an important major power in a volitile region.
I think you are being a bit myopic. Solving the Cyprus problem is not even close to the top of anyone's 2009 to-do-list, save for Cypriots and, to a lesser degree Greek and Turkey. Just watch any international news and see how often there is a mention of Cyprus.
It is the primary role of any country's government to look after the welfare of its own citizens. I can think of no third-party government that would gain any benefit from cutting off links with Turkey in order to persuade Turkey to take soldiers out of Cyprus. In reality, even if such isolation took place, it is unlikely to succeed in its aim, as it would only strengthen the hand of those within Turkey who wished Turkish soldiersto remain in Cyprus.