Hi Abou the cons of all this is the possible breakage of Bitcoin.

The break of the Bitcoin in two or more cryptones is a hypothesis that in the first test of the testnet for Bitcoin, has proven to be a reality and is that from block 27070, there were problems in the mining and the coin was finished starting in two. If this happens, the BTCA (to call it somehow), would be Bitcoin itself, with a significant loss of value, being able to fall to 600 $, while the BTCB, a byproduct, could have between 1-10% of the Value of BTCA. This situation, if it happened, would cause Ethereum to be the strongest criptomoneda in the market, peeling off at $ 2,000 in a matter of hours, followed by Zcash, who could shoot at $ 1000, quietly.