Make noise.
That's what matters above all. Make Wizards know that you are unhappy. Loudly, repeatedly, in channels they will see. (There's a 1D&D playtest survey up right now where you can enter text responses; filling it with angry comments could start them worrying about their big upcoming release.) Tell other people and get them making noise too.
If you aren't making noise, you won't be heard.
Boycotting is good too. But, again, make sure they know why. If you cancel your DDB subscription, be sure to say why you're doing it.