What will be the future of bitcoin after the Ethereum project?
Here's what Stephen Tual has to say about it:
"Bright. Ethereum does not supplant Bitcoin, nor does it try to. It complements it.
Bitcoin is your store of value, your gold vaults. When you want to put your capital to work you need an engine (Ethereum) and to run the engine you need oil (Ether).
It's completely possible to imagine (in my view, inevitable) that we'll frequently see derivatives built on Ethereum backed by Bitcoin."
https://www.quora.com/What-will-be-the-future-of-bitcoin-after-the-Ethereum-project