Qualcomm should not be allowed to buy NXP, for various reasons. One is their ambitions as Patent Troll. If Broadcom ended Qualcomm's royalty approach (which ought to be illegal), it would be good.
TI bought National. ADI bought Linear Tech. Intel bought Altera. Microchip bought AVR. I don't see a huge competition issue on Broadcom buying Qualcomm as long Qualcomm does not get NXP (not approved yet in EU last time I looked).