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?
Bitcoin will not die even china banned this to there country. We all now that china has a big impact to the community of bitcoin, but it doesn't mean that bitcoin will die if china banned this. Not only the china accept bitcoin, there are a lots of countries who accept bitcoin just like US, Japan, Canada and other countries around the world. There is no reason bitcoin will die even china banned this. Us long us there are people use bitcoin bitcoin will remain.