Remember when digital first came out. It was the future, but at the time it was nowhere near as good as film, with the exception of no waiting to get it developed... The technology matured and we have moved from digiotal being noise in the sales charts to where film cameras are the noise...
Most of us think that mirrorless and EVF is the future. When it first came out, it was terrible, but as the technology matures, the results get better and better until here we are today where the winner is debateable, and moving towards where mirrorless will be the overall winner.
AND, just like with film, there will remain cases where the mirrored camera is the best choice. Mirrors are not going to vanish, but it is a safe bet that they will loose their place on the top of the sales lists.
The only members that "took a beating" are the ones that insisted that it had to be done NOW! or Canon would quickly suffer destruction.