This is exactly what they want: CONTROL. Over anything they possibly can. If they could control how much you eat and drink per day, they're more than happy to do so. Having a wallet linked to your bank account would mean your name linked to your wallet... So anytime you'd do a transaction, everyone would know who sent it and to who exactly. And I'm not even going to mention a word about the taxes we would see for using Bitcoin.
Government and taxes can not be separate, there will always be tax for bitcoin if you want store it in bank.
That's a good thing if we can convert bitcoin into fiat money easily in bank, but blockchain technology are totally different compares with bank rules. I agree that anonymity is one of good thing in blockchain technology and it would be gone if linked to bank account.