It looks as though the rotation freed by dropping LTN - TSF is being used to fly the second LTN - BGY (so both Bergamo flights will be operated by Luton based aircraft). The rotation freed in Bergamo is then being used to fly a fourth daily BGY - STN from the end of Feb.
So it doesn't look as though LTN will get any more new routes from Ryanair for the time being.
However, with 30 new aircraft to be delivered between September 06 and May 07, there must a fair chance that more routes will be on the way before too long.