Alternative blockchain are already taking over.
Take a look at this analysis:
This is the percentage of value that BTC retains vs the value of all cryptocurrencies. In 2014, BTC retained over 90% of the market.
So far in 2017, the increasing value of Ethereum and all other coins has caused that number to drop to 67%.
This means that 1/3rd of the value of cryptocurrencies are in blockchain besides BTC.
This trend is likely to continue. Even without BTCs hard fork politics dropping the price, other blockchain like Ethereum, Dash and Monero innovate in ways beyond Bitcoin.
Even if the value of BTC goes to 0, the market cap of the cryptocurrency market would be $7.5 billion, or roughly what it was worth in January 2016.
Blockchain is here to stay, with or without Bitcoin.
Originally posted through Quora.