People might be against change, that part is true. However i doubt that they wouldn't use a pokemon that would help them to counter a popular strategy if they had to. The examples are plentiful. Azumarill's usage shot up once we found out it could counter Excadrill very well. So did Slowbro's when we found out it was a solid Blaziken check. People will run them if they have to. Only Bad players would stick to their so called "good" pokemon if there were better ones at hand.I really can't. As I have been saying, we can't know what will counter it without letting it happen first. However I do know many current highly used Pokemon can't, which was the main point of that statement. People get attached to their Pokemon and will oppose a change like this if only because they don't want to have to adapt. People hate change. It's unfortunate, but true. But it is only after we change that many of these things can be discovered.
If these pokemon truly existed, then why weren't they discovered in Round 2 when Drizzle+SwSw was running rampant. People were experimenting with tons of things back then and nothing seemed to work at all. If your going to blame the Big 3 for that then you are wrong. Their power level isn't far from some of the SwSw's below them.
Bottom Line: If these strategies and pokemon did exist we would have found them already. Ergo, they don't exist.