Micha I think you are correct, I dont think extension blocks (or
sidechains for that matter) can allow soft-fork increase of the total
Bitcoins in the system, because the main chain still enforces the 21m
coin cap. A given extension block could go fractional, but if there
was a run to get out,
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Exactly,
In the coming fee market crunch, any speculator would trade an
extended block in the implied direction and also hedge in the opposite
direction in case it gets rejected.
The speculative public will most likely trade in the same direction,