No thanks. Those people you don't care about leaving behind are the people I'm happy to have in my groups. I enjoy helping them. If they're bad, that's fine. I'm a good player and I can shore up their weak spots. I enjoy being their hero. I enjoy the camaraderie of failure. Those people you want to leave behind are the ones most likely to laugh with me if we wipe. Then pick ourselves up and try again. And sometimes again and again until we get it. I enjoy that this game makes people who just want to have fun feel welcome.

There's nothing wrong with asking for more challenge in optional content. It's optional. SE may want people to do it, and so they may be resistant to making it too challenging, but it's a valid argument to have. If the problem is people aren't prepared for Extremes or Savage, then as someone else said, request more in-between content leading up. But I will have to say no thanks if you want to make the MSQ more unfriendly and leave behind the people I enjoy having fun with.