I personally dont think that it was a virus. I mean i logged in several times into my bankaccount too and there was everything fine. But maybe on the other side its easier to steal your btcs than your "real money". Maybe i just got hacked and thats it. Either way for me the wallet at blockchaininfo is dead.
No, blockchain isnt dead since its being used for how many thousands of bitcoin users since this wallet is easy to use when it comes to online transactions you are just unlucky to get hacked by someone. They do have your logged in information which supposedly you do get from virus or keylogger. Ive been using this for years now and i dont have experience such problem on losing funds.For now reformat your pc install antivirus then dont tend to download random things on internet.You can say that you dont have virus but actually its just sitting down there on your pc without any knowledge or awareness.