What's does a 2:1 guarantee these days? That the holder can probably write in cursive script (or joined-up writing as modern academics term it) and may even know that Rimbaud wasn't a US film character. No, these days one needs to insists on a master's at least to have a hope that the holder possesses some measure of academic nous. But need this be compulsory?
I am just old enough to have had masters who wore their 'stuff' gown to class, and one or two carried a cane. These were the brains. Then we had the characters - an ex submarine commander who taught maths in an idiosyncratic but highly effective way, a bluff ex-ICI research chemist who preferred to teach, a French master mentioned in dispatches for his counter-insurgency fighting in Malaya. Teaching to 'O' level needs a mix of the academic and the charismatic, and if the two aren't to be found in the same person then they should be present in the mix of the Senior Common Room. And I recall a large degree of collegiality amongst the masters; collegiality and tenure I think were the key to the way in which our teaching staff worked together as a finely honed machine.
Much of Labour's mismanagement of everything comes down to a socialist culture of managerialism, under which everything becomes a 'career' and nowhere is there room for a vocation. The best teachers are not those with double firsts, but those with a genuine vocation, who may even have eschewed careers elsewhere in order to teach.
The future success of all our schools is dependent on wresting interfering micromanagement from the hands of incompetent idiots such as Balls and giving headteachers, and their governing bodies, real independent control over their schools; recruiting teachers whose sense of responsibility towards their charges exceeds their career ambitions, allowing independent external exam boards to determine standards and curricula and giving parents real choice, through a voucher system, of school for their children.
The family, the first of those 'little platoons', is one of the bedrocks of a healthy society; the authority of local institutions, including schools, is another. Both have been grievously injured by Labour. I'm not sure that a 2:1 bar is the answer, but at least it demonstrates that Cameron's thinking is in the right direction.