I think there is a risk that we exist in a bubble where something like Universal GB is incredibly exciting for us, and the people of Bedford, but the average voter is 1) not going to know about this and 2) even if they do know about this, they're not going to be basing their electoral decisions on this. This may exercise voters in the local area, but do you really think Jack from Bradford is going to vote on this issue over, say, the NHS waiting lists or a lack of teachers in schools?
To answer your second point, I fail to see how a planning application of this scale can be 1) developed be Uni in consultation with statutory partners 2) delivered to relevant Gov departments 3) progressed through statutory public consultations and 4) approved....all before the probable election in Autumn.
Can I remind people that the UK Gov has currently spent £300 million on a planning application...for a bridge. If you were to read all 360,000 pages of its various application documents it would take you over a year of constant reading 24/7 (nope I'm not joking). We just aren't quick at planning in this country and there is no reason to believe this would be different - although I'd love to be wrong.