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There is hope ahead at the end of the tunnel.
Olympus still have a capable lens designing team.
So they could become a 3rd party lens manufacturer like Tamron and Sigma.
They had some patents a few years back for mirrorless Full Frame optics. but they're going to have to hurry up with those plans if they still want to, because it's getting quite fierce with Samyang+Tamron+Sigma already having a massive headstart.