“Bitcoin is having its own capacity problems right now. A technical solution is available, but it suffers a similar problem to BitTorrent. There are many competing wallets that need upgrading in order to take advantage of the SegWit capacity increase.”
Segwit is an optimization at best, and a sneaky political attack at the worst (due to punishing normal bitcoin transactions in favor of segwit transactions).
Allowing the Blocksize limit to increase is the basis of scaling at this stage.
Blockstream/Core is going directly against the very fundamentals of this system that Satoshi laid out and described.