I'm not going to defend Twitter being a utility (which the parent comment also doesn't mention) but I will say that in general, it's very clear to me we haven't worked out what kind of institutions can best deliver services in the digital age.
It's profoundly dubious that Twitter - a defacto 'town square' for public discussion - is owned by an institution that, at best, has few incentives to make it effective for the purpose which it is widely used.
This is significant in democracies, where the quality of national decision making will be directly linked to the design of the channels in which public debate happens.
The idea that we can take full and fair advantage of the opportunities the web offers exclusively through profit-motivated corporations is flatly wrong.
The fact that as Twitter users we agreed to some T&Cs doesn't mean we can't also wish for a more democratic digital public space - which I assume is what the parent comment is really getting at.
I'm told that in Afghanistan it played (plays?) a key role in for aid agencies.
Twitter will never realistically be a utility. But there can be an open and distributed replacement for it that will meet the same goals, with fewer corporate restrictions and a more fractured government intervention.
GNUSocial is a great replacement for Twitter. With multiple hosts, your data is yours, you can move data between hosts and you can even choose to host it for yourself to control your own data.