The 'rumours' come from Vueling and easyJet respectively. Speaking with various people from each around the networks (not cleaners). I am not saying it will happen, I could not possibly know, I am merely passing on what I have been told.
Vueling is unusual for domestics yes, but have apparently approached LGW and EZY re: slots.
Whether people can 'see it happening' or not is irrelevant, it is information from what I would consider a credible source, not a wishlist of 25 European destinations that I would love to look at on the departure board, but never use, which makes a nice change.
It may not come to fruition in the end, in which case so be it