I think that you make mistake with the meaning of wallet recovery. It is possible but only when you made wallet backup - it is the most important thing when you think about Bitcoin seriously.
You mean private key backup? but not all web wallet has its feature, so we can't assure that you can get a backup for that instead 12 passphrases recovery will do.
what is use wallet blokchain.info, i think in new blockchain can't regenerate addres
What are you talking about? Who tell you that you can't generate new address from blockchain.i
if you want safe use blokchain is good you can import addres another service, save private key, and import to blokchain.info
Well as I can understand you, much better if you do that instead of using blockchain.i HD wallets.
To OP I guess you should tell us and try to remember if what web wallet you used or where it from(12 passphrases) so you can recover those bitcoin of that wallet if there is.