My guess is after Sou-Ams, regional will start competing with flybe and bacon on the Sou - Man/Edi/Gla. I doubt if you'll see a baby 733 down there.
It would be commercial suicide for BMI Regional to start SOUMAN/GLAor EDI let alone AMS but hey when has that stopped them in recent years. They have neither the right equipment nor low enough costs to be able to make any of the routes pay from SOU. The cost of opening a single aircraft base at an already congested airport seems crazy but we'll see. As with others on this forum, I cetainly believe that SOUAMS could go in the same direction as EDIMUC and LTNBRU. Its just a matter of time...surely.