You may create armory wallet, then make paper fragmented backup. Send fragments to several your friends or family's members. When you need to restore your wallet, collect "n of m" fragments from your friends and voila! You may also store paper backup in your deposit box in bank if you trust to bank and to your government 
Yes this could make the deal I guess.Splitting it in 2 if a good idea to avoid robbery / losing it.
I guess it depends on the persona. I'm definitely not a fan of "long term cold storage" that is not attended. Even the sharpest minds are at risk of forgetting their passwords over a long amount of time if they don't use it at all.Yes, but the odds to lose two passwords at the same time are smaller than losing a unique one. Specially I dont think I would forget my email password 
Well, that is true. However, you have to remember 3 passwords which becomes a bit harder unless they are similar (which would defeat the purpose of using multiple passwords in the first place). As said, there's definitely not a singular 'best' method. You'd have to evaluate these suggestions and try finding a solution that fits your persona. Blockchain.info atleast have option to import bitcoin address through private key to your wallet.
The recommended practice is staying away from trash such as Blockchain.info, not the other way around.