No matter how you slice it, this is another tax-and-spend program. Hey, Hillary! If you're going to spend $350 billion more, then you need to offer a new tax that's going to raise that much revenue. Stop and think: That's over $1000 for every man, woman, and child in the US to fund a one-semester drinking binge for tens of thousands of non-serious students. Perhaps then people will sorta understand that there is no free lunch...anywhere. Serious students are willing to invest in themselves. Free tuition brings out everyone else.
I think the system in France has changed in the past 20 years, but when I briefly taught at a state-funded university there in the mid-1990s, tuition was free. The job market graduating students faced was awful and, with free tuition, there was no motivation for most students to take their studies seriously.