Just been reading this about the BTC developer Mike Hearn selling all his coins and warning of its fate...
He has now quit as a developer
https://medium.com/@octskyward/the-resolution-of-the-bitcoin-experiment-dabb30201f7#.akjw17yd5
If BTC dies, everyone will move over to other platforms such as NXT, NEM, IOTA, Ethereum etc.
If bitcoin die all of altcoin will be die too,
i think he just want to sell his bitcoin and buy back at lower price