This game is in serious trouble if a team from the capital of England is replaced by a team from a run down pit village.
You could say it's merely a return to the status quo ante bellum. London were artificially placed in SL from it's inception. They have been given a good long run to make it and, unfortunately have not succeeded.
I don't think London are regarded as a big ratings draw by Sky. They might well get more mileage from hyping the David v Goliath aspect of the smallest village in England with a pro team versus the Man United, Arsenal like giants of Wigan, Leeds et al that could be marketed should Fev get a SL spot in London's place.
I don't think the game would be in serious trouble at all. In fact the development of a healthy rivalry between Skolars, Broncos, Hemel and even Oxford might do more to promote the strength of the game in the south East and, with p and r back on the table, lead to one or more of those teams graduating to SL on merit this time when they are ready to step up..