Let's see if this is possible.

First of all, we suppose that all 39 european countries from this year,
will also compete next year.

Then, we have information about posible returns from Bulgaria, Turkey and Croatia. (42)
Bosnia, Ukraine and Slovakia are not out of question. (45)
Maybe there could be a posible surprise return from one of Monaco, Luxemburg or Andorra. Or Even a debut from Lichtenstain. (46)
Finally, maybe EBU will have another guest country, for example Kazakstan. (47)