Orders may have slowed down, but the used -300/-320s are highly sought after ! You should try and order an ATR42-500 and see how long it will take for you to get it delivered...
I think ATR hit it right by sticking to the ATR-42 and -72, 50 seater that can operate in rough environments and fly in and out of 900m runways... even the F50 can't do that, and don't expect any RJs to do it.
You can expect the ATR42s and 72s production to last for quite some time. If their end comes, the manufacturing staff won't all go airbus, since it's a 50/50 JV
between Finmeccanica and EADS... With certain plants and suppliers making certain parts.
However, if the sales staff go to EADS, that wouldn't be a surprise !