Imagine the situation when top-10 mining pools will accept this protocol change in 4 years from today.
There will be split of network in ~2018.
I think that the majority of users will follow the pool-owners
No, they won't. They'd have no economic incentive to. If a cartel of a few individuals can change bitcoin at will, then bitcoin loses its only redeeming feature and becomes a very expensive, less usable version of paypal. There is absolutely no way that any central party can mandate controversial hard-fork changes to the bitcoin protocol, no matter their hashrate.