It would be interesting politics if EI via EIR set up in competition against BE. I don't see it happening personally.
EIR are also becoming short of A/C to cater for much more expansion. I think they will be taking their options up soon for some new '600s. They scraped through this summers schedule but had to rely on the wet leased DAT aircraft when BYO was scrapped. I can't imagine that Stobart will want to do that again unless it finds itself in another hole.
Although having said that, looking at the loads at SOU, they might have the '500s back sooner than expected!