Earlier quoted context omitted.
Would you consider company going public as change-of-control that should trigger voiding trademarks?
Defining what represents a change-of-control is probably the trickiest part of moving this from an interesting idea to a real proposal. Probably, the key factor should be whether or not the senior management and/or the board membership stays essentially the same; new management should be required to earn their own trust from customers that might not follow company news.
Defining "essentially the same" sounds hard, especially if a series of "small" changes happen over a period of time. Ship of Theseus, anyone?