I think the EU is mostly worried about the loss of UK £6.5bill net annual contribution...
i had believed that to be the case, but not anymore - but its, imv, more complex than that.
within the EU
structures, i've come to the belief that its not the money thats the driving force, its the project. the determination is to show that the loss of the UK isn't a loss, its full steam ahead now the pesky brits have gone - and as evidence of this, look at the way the EU is expanding its remit into the defence sphere, its moved ahead quite significantly in a couple of areas in the short time since the UK lifted its veto, and as part of the
project, i very much take the view that the UK must be seen to suffer as a result of the leaving the EU.
within the member states i think its much more about money and trade, Germany doesn't want the bill, France doesn't want to have to start paying its own farmers, but the member states (particularly the eastern member states) are, imv, willing to be much more flexible in order to keep the UK involved in NATO - they understand the political reality that if Romania, Poland, the Baltic states etc.. are the 'enemy' in a trade war with the UK, the UK is unlikely to keep sending its significant military deployments to the border with their troublesome neighbour.
i don't think there will be a deal, i think the UK will crash out in march 2019.