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The point is that I think EF and *ER lenses will coexist happily for a very long time. I don't see an urgent need to replace everything, and the demand for EF lenses could go on for a very long time, even after Canon has stopped making DSLRs.
Besides, whether I am right or wrong, I don't think that Canon are on a mission to make EF lens users dump their D-SLRs but are simply taking advantage of new technologies (mirrorless in this case) to exploit and expand their whole camera range including not only stills/video EOS but also Cinema EOS systems. I don't understand those who seem convinced that every major corporation is on a mission to steal their money by every underhand means possible.
I think the future will evolve organically and also with a pinch of market influences.