Based on revenue per employee comparison between Broadcom and Qualcomm, at least 20% Qualcomm headcount cut is reasonable. That is about 7000 people.
On top of it, there will be additional $0.7-1.3B cost reduction in overlapped business like WiFi meaning around 4000+ layoff in those business units even though that is one time thing.
Posted by @QoJuebQ-1hxe, sounds about right.