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An interesting theory but I don't think the timelines quite add up. D&D descent into wokeness has been slow but continuous and gradual and started before M:TG was in trouble. I'd argue that the first sign of wokeness was when WotC patted themselves on the back for their "Diverse" iconic characters in the third edition Players Handbook.
Once you go down the path of virtue signalling there is only one inevitable end. You can only have your first female paladin once and your first gay ranger once. As the need to continually virtue signalling remains, you're forced to insert ever more bizarre and unlikely characters and esoteric rules changes until you finally reach the point where "Even the dog is disabled!".
The pedomouse already beat them to the disabled dog thing in their latest animated movie box-office bomb.
I find the sales of the 5e handbook interesting considering that D&Done is coming in 2024. Everyone and their sister knows that the new hotness totally not a new edition is right around the corner. Best case scenario; "backwards compatibility" will be the same as it was with the 3.0 to 3.5 transition.
Yet people are evidently snapping up the soon to be obsoleted class and subclass write-ups like hotcakes...
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Wait, third edition player's handbook had diverse characters? You mean the 3rd edition Dungeons & Dragons book right? I recall them being all european, which honestly makes sense for a fantasy setting which is 99% inspired by European folklore.
WotC made a big point of it.
WotC purchased TSR in 1997
By 1999 "TSR" art was already well on it's way.
"POC" front and center. Death to captain white-bread!