On all of this - no. I am in the 'corporate world' now, and the idea that anyone - Mearls included - is somehow so diabolical that he could both design it to fail, not blink at throwing away potentially millions of dollars on a project he manages out of spite, and then cackle over a pile of money - is kind of fanciful.
I think you're giving him too much credit, when other explanations are at least as reasonable without involving conspiracies.
You failed your reading comprehension check.
I specifically stated that I was NOT accusing Mike Mearls of orchestrating 4E's failure.
NOT.
NOT.
Is that clear yet?
But he was a cat's-paw for those who wanted Hasbro to sign off on the new edition. He's a salaried designer (or whatever his title is this week: WotC changes job titles several times a year) so the idea of him sitting on a big pile of money is fanciful, at best. Again, that's not what I said or even implied so here I am defending comments I never made. Or implied.
Again, you're mistaken if you think an executive wouldn't make a play that involved losing the company a million or so in the short term in order to prove a point that would (hopefully) result in the gain of millions in the medium or longer term. That's common behaviour among mid- to senior level executives, especially in a company where the MD/CEO is generally clueless and/or issues contradictory directives (also shockingly common). In this case, Hasbro was largely "hands off" with respect to the running of D&D so that made it even easier to do... as did Bill Slavicsek's departure as a lot could simply pinned to him.