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.
That's irrelevant, you give incentive to people to want to javascript mine, for premium access time, game items, whatever. It's for websites with large userbase. You don't stealth mine in background like a fucking asshole raping their cpus and wasting their power while they have no idea what is going on.
And it is working pr0gramm.com users mined 5k usd worth of monero in just a week.