That's exactly what's happening in Iceland ! After the 2008 crisis, the people didn't want to pay for the banks to be saved. Then they forced the government to leave and ditch the current consittution. Now, they are not just writing laws, they are writing a whole new crowdsourced constitution !
They selected a few people who are in charge of making the new constitution, and then everybody can comment on what they propose on FB, Twitter, on their website... When it makes sense, they merge the suggestions into the draft and iterate again.
And in the end, the new constitution will have to be accepted in a referendum and the "government" won't be able to change it. This is really "for the people, by the people" !
And it's not a surprise that our leaders (in any country you could live in) don't talk about it...