The day when a “latency free” and “blackout free” OVF became available is the day you are talking about. A had a bit of a play with A9 and the OVF lag is quite noticeable.I believe it will look (to many people) like DSLRs will continue to to coexist for years to come, until one day it will look to everyone that they are dead. That day is easily withing 5 years. Maybe 3.
There is still some Lag in the new Sony A9: Sony Alpha Full Frame E-mount Talk Forum: Digital Photography Review
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