I haven't played the Call LCG, but warhammer invasion is the sickness.
i'd like to note, that I'd be totally happy with FFG printing UFS as an LCG. EVEN if it's only FFG original content.
I can't see how that would be bad for them. The game system is fully designed, They don't have to make old cards illegal, they don't have to do actual organized play, It might even help move the old product, because people won't need to buy as much of the new sets. Still holding worlds would be cool.
Change the way they print the worlds prize. Just put one copy of the player designed character in the next Box set (that comes out ~ 1/ 3 months) and don't make all the copies exclusive. costs them 0 extra, and people still get the coolness. Sending that player a few extra copies would be cool, but really wouldn't matter much to me.
I'd play the UFS LCG.