So in summary, from reading this thread:
1) Miners voted for Segwit, and it got approved.
2) Most of them haven't implemented it yet, so the block size charts don't show a huge change.
3) Coinbase say they're going to go live with it in the next few days
Sounds like we need to wait a little while to see what happens.
1. Miners signaled for Segwit because if they didn't BIP 148 would become active. They did not vote for it or implement it.
2. They removed Segwit from their code, the transactions per minute have dropped to pre-Segwit levels.
3. So many do not understand how Bitcoin works. Only mining pools running compatible software can upgrade BTC. Coinbase can add Segwit all its wants, no one will process Segwit transactions.
Segwit was not implemented.
You don't know how it works.
Every single block over 1 MB has SegWit transactions - so almost every single block. Also block which are 1.0001 MB can't be a legacy-transaction-only because then it is too big.
You do need to use new addresses, and that's why it's only used by a small number of users. At this time around 14% of all transactions are SegWit, if you like it or not.
And yes, you have to wait before the sheets are loaded.