Players in general aren't that principled, if anything player behaviour has shown quite the opposite that there's almost none. Basically every major planned boycott by players due to company decisions gets ridiculed when the most fervent players ends up being the first to break from their supposed values.

If SE's sub went up to get rid of the cash shop you'd see far more people leave over the extra money, even if it's inconsequential- because regardless of what people signal regarding their feelings on MTs (and right now it's generally considered hip and progressive to hate it when companies make money of any kind), at the end of the day everyone's out for themselves and other people buying cash shop items to keep their own sub lower is always preferable.

It's a different story when the RNG elements of loot crates or the p2w aspects of the cash shop actually start to affect your in game content, but in this case that's not happening to anyone other than the few who both greatly want the new mount, and also greatly despise MTs.