It could be, but if the bitcoin is gone it will probably lower the person using the blockchain. It has many usage like in a simple transactions that until today it is still exists because of adoptions.
For me,its a Yes.Blockchain is a digitized,decentralized,and a public ledger of all cryptocurrencies,so meaning even without bitcoin it will survive because people can choose any of the other cryptocurrencies.But for now it is not happening.