I guess the best answer to that question is of course a BIG NO! Granted, China is a big contributor for the rise and adoption of Bitcoin and they are primarily the country involved with Bitcoin mining due to very cheap electricity cost.
Now, the Chinese government has its own agenda and I think in the long run Bitcoin can be running against those agenda so they are now thinking of slowly disengaging and disconnecting their citizens away from the cryptocurrency platform.
I know that whatever China will decide on the impact can be heavy on the market and this is shown with the recent decision banning the ICO projects and the unconfirmed total ban of Bitcoin exchanges though it is still a rumor and nobody would want to confirm.
Can cryptocurrency still go on and have a very optimistic future even without China as part of the equation?
The answer is NO. But when investors see the nega effect that China can make on bitcoin price, their passion may fall for fear of other countries doing the same. Perhaps this year is a year of ice and fire for bitcoin and winter is coming.
The life of Bitcoin doesn't solely depend on china and that's why it is decentralized. I know china has a bigger stake in terms of mining power and investment but that doesn't mean if they decide to leave the network others won't replace them and so I don't think Bitcoin will ever die because of the Chinese and their drama.