There is "no smart move" to move to EOS blockchain. In blockchain there are trade offs in platform use, trade offs like true decentralization, security, scale-ability among many others.
Ethereum is a clear definition of decentralization. Also, there have been several changes and improvement going on from the developers and as software's continues to improve there would be a smooth transition from PoW TO PoS and becomes scale-able. EOS is relatively new and will need time to house as many dapp that is currently sitting on the ethereum blockchain.
Not at all. Even BTC mining is more decentralized. ETH is mined by few mining pools. With EOS/STEEM no single entity gets to mine more than 4.76% of the blocks. These witnesses are voted by the token holding community instead of few people/companies with money to buy hardware. PoW being decentralized is a complete myth.