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There are rumors that miners will not activate segwit until Core has coded a HF blocksize increase for them... given Core's lack of desire to do this... it could be a VERY long time before anything happens. I would be shocked to see any additional capacity before the halving comes and goes.
Is there any source for this? Are you referring to P. Todd's tweet?
Peter Todd's AMA on the chinese forum.
much of the hashing power has already said they're not going to run segwit until a hard-fork is released,