I think Cisco, Cavium and Broadcom are licensees;MIPS is the licensor. Apologies for nitpicking.
It would seem possible that ownership of MIPS by one of these licensees would frighten off the others. SPARC is controlled by a consortium isn't it?
As the Chinese have shown long term interest - up to government level - in the MIPS ISA I would have thought that an attractive proposition has presented itself.
It would be a very interesting turn for a China concern to buy MIPS and earn royalties from US chip makers. But as you say in this mobile and power constrained era the most interesting cores to be licesing these days are ARM ones.