Only until someone does the same thing to the other chain. The logical next step is for the miners leaving the biggest chain to concentrate on a chain where they can successfully pull off the same attack that just drove them away, and on down the line until all chains have been taken over by one large participant each.
The steady-state is a reduction in mining activity across all public blockchains by ~50% or so, although that's probably an upper bound that wouldn't actually be reached.
The steady-state is a reduction in mining activity across all public blockchains by ~50% or so, although that's probably an upper bound that wouldn't actually be reached.