Even if it happens it won't last. They never do. There will always be a train service from Liverpool to London. The air service between those cities has a rather chequred history which is no use at all to the regular traveller and simply takes a tempory tole on business rail passengers until the air service collapses or the customers get peed off with all the airport hassle and return to the (at present pretty poor) rail service.
Intercity travel in UK should be by high speed rail (as it is in mainland Europe). Not a tarted-up and unreliable Victorian infrastructure - a real, new, high speed railway. It's much quicker door to door, environmentally sound, far more convenient than all that messing around at airports, and it frees slots at the hubs for long distance, where air travel makes sense.
But it requires a long term view and committment from the government, and unlike those on the other side of the channel, no UK government of any colour has ever had the balls to do it.
SSD