And since not all users, but only miners, decide which transactions are included in blocks, soft forks can be carried out by a mere majority of miners by hash power. (bitcoinmagazine.com)
Today, a great majority of miners are located in China because they have access to cheap electricity. (howtotoken.com)
To implement SegWit2x would need the absolute majority of miners to agree to fork, however, since it's a very and radical change, which will require significant hardware and capability upgrade for nodes due to the blocksize increase. (thenextweb.com)