I think that Košice might end up jumping ship to the EBEL, especially if the Slovak Extraliga continues to decline, and the EBEL continues to arrive.
From what I believe though, any new team to the EBEL has to pay the travel fees for teams travelling there for the first two years of their entry (some Hungarians told me this at the Division 1 World Championships in Ljubljana). I don't know whether they would want to have to pay those costs.
AFAIK it was only case when Alba (today's Sapa) played their first season in EBEL, as they were most dislocated club...or some similar reason. But as I said that was only for first season. In case of Kosice, I think they wouldn't have to pay like Hungarians did because they would be huge upgrade for EBEL league.
If Kosice goes to EBEL it could pull out domino efect, with Dukla,Banska and Zvolen joining EBEL as well...who knows...it will be interesting to see what is going to happen in few years from now.