[jacquesm]

They will have a harder time because they will effectively be a new outer border and especially for Bulgaria there are some challenges in dealing with this. Which is a pity because I personally would love Romania and Bulgaria to become part of Schengen. It makes life so much easier if you travel there frequently.

[foobarian]

Honestly maybe getting Croatian borders dissolved will be enough because in-season traffic is just such a sad waste. I would guess that traffic on the new borders will not be as bad.