The switch from mining to PoS has been baked into the fabric of Ethereum for years. To prepare for this, the rewards for mining will decrease sharply. The miners all know this. So does everyone else. If Ethereum offers a range of services and benefits that people want and like, then the miners can fork all they like, it won’t do them any good. PoS offers the same, or perhaps even greater security as mining, but without wasting money on electricity or time on computation. Staking will also increase the value of circulating ETH.
As for EOS swooping in to steal Ethereum’s thunder: this is very unlikely. Never mind the dodgy optics of the EOS ICO, the developers will have to build a bulletproof system with as much utility as Ethereum, within a year or so at most. They might have a ton of money (which some see as the whole point of the exercise), but they don’t have the coders, the community, or any kind of product. It’s a big ask. Once Ethereum has shifted to PoS, the prospects for the competition look mighty slim.
Ethereum has reached the position it’s in for a good reason. The market recognizes this.
