[dragonwriter]

“Oops, he slipped through our fingers and got away to Russia” is arguably one of the better possible outcomes for the present US Administration if Ecuador boots him, at least if that happens before Mueller closes up shop.

[notahacker]

It's not a good outcome for a UK government that has to justify letting him slip through their fingers having previously spent an absolute fortune on policing.

[dragonwriter]

The UK government seems to have recognized he sunk cost fallacy as a fallacy when they stopped the 24×7 “grab Assange if he leaves” watch.

Presuming Ecuador doesn't telegraph the timing of the ejection, I don't think there's a whole lot to justify that the UK government hasn't already clearly accepted the risk of needing to justify.