The other point is that the UK is delaying negotiations to the detriment of their position. As the impact of uncertainty weakens their economy, the hurt on the EU lessens, as public opinion shifts and GE becomes closer in the UK the EU gets more leverage. The longer they delay the less willing the EU will be to negotiate they want negotiations to start this September not next September.
Also French and German elections are coming up, these member's agendas will change based on that too as their attention shifts to their domestic issues and trying to appeal to their voters. The UK will be treated accordingly.
Then you also have to consider that Spain and Italy's European profiles just got elevated a few notches by virtue of the UK getting out of the Union.
Spain will probably tell negotiators to find a deal that is ammenable to its exports since the UK is an important partner for the local automotive, machinery and produce industries, but if the British economy begins to deteriorate it will make a huge push to strip it from its assets in order to make for the loses.
As a matter of fact, there are already preemptive bids for the London-based European Medicines Agency (EMA) and both Madrid and Barcelona are well positioned to suck up a good part of the financial industry, since there will be significant European pressure to avoid the brunt of it going to Germany if the UK loses its financial passport. Ford, GM and Nissan would also probably move its production facilities to Valencia, Zaragoza and Barcelona, along their local providers. Given the absolutely sorry state of the economies of the Valencian and Aragonese governments and the cheaper labour costs, I expect a large effort from Spain to grab a large part of UK's automotive industry. Chances are this is already underway.
Luton, Cowley, Oxford, Ellesmere Port, Castle Bromwich, Swindon, Sunderland and Burnaston (not to count Ford parts manufacturing factories in Bridgend, Dagenham and Halewood) are set to take a beating, with Spain throwing most of the punches.
I'm particularly familiar with the British and Spanish automotive industry and UK has a lot to lose there from Brexit. There's going to be a bloodbath unless the UK magically manages to avoid large import and export tariffs. I really, really hope Leavers enjoy the MG range of cars.
The UK's position weakens with each day it passes without invoking Article 50.