Broardcom's entire business model with these acquisitions (they did the same thing with others before VMWare) is to acquire something everyone depends on AND can't easily switch off ... and then jack up the prices by an insane amount.
It doesn't matter if most customers eventually leave: they will stick with what they have, no matter the cost, long enough for Broadcom to cover the entire cost of acquisition. At the end of the day they have more money than they started with, a small fraction of customers still paying, and some significant IP.
They win all around, and everyone else (including the acquired company and its now-fired employees) loses.