I just want to ask, is there any possibility that blockchain will cease its operation? What will happen to my btc with them?
You can download the backup and import it on multibit, Based on their website they claim they store your wallet in encrypted form if the hacker hacks the website they cannot access your wallet. But my suggestion do not put all your bitcoins in blockchain.info. The best storage for bitcoins is bitcoin core wallet with clean and isolated pc intended for use only for bitcoin.
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Thats the thing, most users wont bother doing that as it takes time and knowledge to set up and use properly. I just 2fa all my accounts.