No, certainly not. The Avros will be ZRH based to replace ERJ145 there. BSL was the Saab 2000 base and these are leaving without a replacement.
BSL will only see one locally-based RJ100 for BSL-LCY. For the winter schedule, one ERJ145 will keep operating two daily flights to AMS and BRU, but that's it: Swiss network at BSL down to three destinations - and expect AMS and BRU to see the axe once the ERJ145 has left.
BSL is allegedly already negotiating with KLM for a AMS route, btw.