I'm sure the option was on the table to "hold off" but in disaster-mode (which is what this is) one of the board's functions is to restore shareholder faith.

They aren't going to do that by sitting around, so decisive action was taken. As another poster in this thread noted, the search was already on for potential CEO candidates to replace Rose - that process probably got expedited to avoid a further downward spiral.

The problems with V4 are nothing to do with technology or audience fit etc etc, it's bigger than that - it's a management issue. Management launched a buggy product that nobody wanted. And management just got replaced.