Which we must understand that blockchain can be used for all transactions, even many banks that make blockchain to replace the previous server system, of course blockchain can survive even without bitcoin.

BTC and blockchain were born at the same time. BTC blockchain was reserved only to carry out transactions and nothing else can be done over it. It was ethereum who gave the concept that blockchain can be used for other purposes as well. Today there isn't even a single business that  can't be migrated to the blockchain.
If we see blockchain from BTC prospects, we can say with confidence that there is no future of blockchain without cryptocurrency.
But with so many DAPPs now running over blockchain (thanks to ethereum), we can say blockchain can survive without cryptocurrency.
In fact, cryptocurrency is just one application that is running over blockchain, blockchain technology has prospects that are yet to be discovered by the human mind.

Can “it “survive without Bitcoin? Possible in theory (if the objectives are twisted accordingly) but very unlikely in practice.

Originally, the blockchain is a new type of database that can be used and maintained without a central administrator.

Unlike a traditional, relational database, the blockchain is administered through a consensus protocol. Therefore, whenever the word “blockchain” is used, we should ask which “blockchain” is in question, i.e what is the protocol ruling said blockchain.

I think yes! block chain can survive even without bitcoin and I guess there are other way or means in which block chain they accumulated certain amount for it and there are also people behind it who can manage to do what ever it is it...in short block chain can still survive  

There are so many other cryptocurrencies in Block chain technology in as much that bitcoin is the most popular coin. Even if bitcoin fails,I think yes! block chain can survive, everything is there foresight. Adaptable

Bitcoin is better due to the advancement of the blockchain technology. I believe the question should have been asked in the opposite direction. Blockchain is a technology that is meant to add value to how transactions are done in world of cryptocurrencies.

No, that's impossible, because you have to have a built-in incentive mechanism to secure the blockchain in question via PoW.

If you don't have that, you've got a centralized system and then there's no point in using the blockchain-datatype.

I cant see how thats possible. Actually its possible but you need some form of incentive to keep the integrity of the blockchain in tact and a currency seems to be that missing key. Its still the only formula humans have come up with thus far to secure a decentralised distributed system. If you don't mind that its centralised then most backs have a blockchain already of some sorts. In the fact they keep track of unspent transactions.

Assessing the crypto currency, the state first of all note the usefulness of its technology blockchein. Some countries quite successfully apply the technology blockchein, at the same time, they are distrustful of the crypto currency. Therefore, in any case, the technology blockchein will be able to survive without bitcoin. In addition, a lot of bitcoin plugs have been produced now, many coins with good characteristics have been separated from them and they may well replace it with bitcoin if something happens to it.