I think Bitcoin is still decentralized. The 80% miners from China having control over BTC in your opinion failed to take over, because the centralization is divided in multiple layers (miners, exchanges, users and dev's). The (indirect) succes of the UASF has proven this.

Furthermore I think that the mining centralization is on a top now and will redecentralize over the years to come. There are multiple reasons to expect this including the end of Asicboost after implementation of Segwit, the extended lifespan of Asic chips, Legalisation of Bitcoin in Russia and India (perfect countries to host huge mining farms) and the higher profitability of mining because of the recent rise in price (now you can make money on mining everywhere in the world again).

For me the implementation of Segwit is a proof of Bitcoins strength and a transformation from a good payment system to the 'internet of money'.

Extremely bullish!!!!