Outdo? What are you on about? If you're talking about beating people in benchmarks that hasn't changed as 4-Way is still supported there, and even if it weren't you're never going to beat people on extreme cooling. You're also way off if you think that GTX 1080 SLI is what the average Joe has.
They told people there would be an Enthusiast Key, people bought cards, and then they told them there wouldn't be one. It's very scummy. I cannot see how killing multi-GPU beyond 2-Way is a good thing. It doesn't help people who don't use it, and it hurts people who do.