I think my opposition to mirrorless is in the design of the current bodies. EVF aside - that's a separate issue, if Canon / Nikon released mirrorless cameras in the pro-body style I don't think any here would object. I love the ergonomics of my 1D, especially holding longer, heavier lenses and the integrated vertical release button.
I'd argue that all of us can agree that fewer moving parts leads to improved reliability and reduced weight - something mirrorless will offer and would be welcomed in these parts, but the current mirrorless bodies have been marketed as reducing the size of the body.
Imagine how excited we'd all be with a new Canon mirrorless body, in the housing on a 1D, with 30fps and compatible with all our EOS lenses? - It'd be magic.