The only possible justification I can see for boycotting Kickstarter would be if they started acting as WoTC enforcers by taking 20% off the top of D&D-related projects over 750K.
If Kickstarter ends anything under OGL 1.0a, I will boycott Kickstarter. Oddly, most of the Kickstarters I have backed had nothing to do with D&D (or a side benefit as I do a lot of 3D files for minis).
While I have a number of issues with how KS actually works vs how it seems to have been originally envisioned, this isn't really their fault and we haven't seen them be active bad actors.