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No, your bitcoins are efficiently frozen if all miners leave the network - and that's the hope of the most fanatic Bitcoin Cash supporters, they hope all miners will defect to Bitcoin Cash.

I'm a SegWit2X-believer. I hope that in the November split, all the fanatics still sticking to the Bitcoin Core software will experience that their bitcoins are frozen. The fix is simple though, just to upgrade the software.

You mean you or me.
I can freeze mine and you can freeze yours...that is the liberty we all deserve