Tenure isn't, for the most part, in Florida Public Schools, since Governor Scotts first term. NEXTSchool vouchers allow low income families to send their kids to better schools.
It's been tried and is proven successful.
But the left who scream "We are for the minority's and single moms and the poor", are against it. Because the teachers unions would lose their monopoly. Tenure doesn't work the same in free markets.