Good. It's about time. Even if I'm a consumer of these products, I think expectations of personal responsibility are entirely overrated.
People that harp on personal responsibility simply don't understand that behaviour is an answer to a complex multifactorial equation.
You'd all drink sodas continously without stop if they were free, did no damage to your teeth, your body, and you enjoyed the taste. Some people don't enjoy the taste; they don't drink it. For some people, they'd rather not damage their health and teeth by imbibing in soda constantly. And for some people, it's an economic issue; if it stops been so cheap, then they'd probably seek alternatives.
On the flipside, the money that's taxed off the sugary drinks can contribute directly to healthcare... it's a win-win as far as health care costs go; get some money from the people damaging themselves so that they can be covered in the future, or reduce the healthcare costs associated with obesity.
The idea of personal responsibility is good, don't get me wrong. It is a handy idea to have to get people doing things that benefit themselves and society in the long term, and one of the multiple factors that you have towards achieving that end... but it is not the be all and end all of solutions, or even a reasonable social response to anything (because let's face it... if the person you were shouting at to be more responsible could be, the great likelihood is that they would've already been more responsible)