Except, in the case of an acquihire, there is no "acquisition", per se. If 500 startups were to block such a deal, then the founders/employees could simply fold up shop and go to work for the new company.
What the investor is failing to recognize, is that in the case of an acqui-hire, the company has failed - it has zero value, and needs to be shut down gracefully. A good acqui-hire ensure that customers and vendors are paid up to date, and the employees are given a new place to work.
This VC is confused as to the nature of an acquihire, and, furthermore, seems to be ignoring the fact that 99% of the return on their investments come from the two or three companies out of 100 that are very successful. The other 98 to 97 are just a cost of doing business, and worrying about getting back their "investment" on a company that has gone under is just a distraction from the real business of making sure that the two-three companies are very successful.