I tend to agree with you. Some of the EVF's that I have seen on mirrorless cameras are getting close, but as you say, they're not there yet.... I wonder what's under development? It can't be too long before they hit the market at a reasonable cost.
I know it's not going to happen, but wouldn't the pundits be shocked if the 7D2 was the 7DM A mirrorless high end Canon with EF mount and an EVF! If you think the debates now get rancorous, imagine the hornets nest that would stir up....
I think it would be really cool to see Canon add to option for add-on EVFs to their next gen DSLRs sort of the way it work on the G1X II. I think we're still at least 3 generations away from EVFs being able to replace OVFs, but it would be nice to add an EVF when the situation calls for it.