Why We Must Increase the Block Size and Why I Support Bitcoin Unlimited

Actually, it is Core that want to retain the unique monetary properties of Bitcoin by keeping it decentralized and censorship-resistant, while you and your pal Roger want to cripple it and transform it into PayPal 2.0.

As for SW you can see a lot of wallets and libs will have support for it as soon as it is released: https://bitcoincore.org/en/segwit_adoption/

When a user utilizes SW transactions they will enjoy the scaling benefits immediately, and as more users migrate to using SW transactions, those still using the old format will benefit because SW users will have moved their witnesses outside the 1MB block size.