There are already specific plugins for Chrome (No Coin) and Firefox (CoinBlock 1.0) to block coin-hive. The adblockers will soon also block the js coin miners by default. Don't really see coin-hive having much traction long term consumers will not stand for it.
11% of web users run ad blockers. Enough to pay attention to but not enough to dramatically change anything. Source
https://pagefair.com/blog/2017/adblockreport/Others have noted cases where users may voluntarily run it, to earn reward points, etc.
It is an interesting development, though we are in the early stages still.
Not sure it will be regarded as legitimate. Remember this?