Why not its what happens in business? Pay the good teachers well, get rid of the bad
You're aware that teachers are leaving the profession in unprecedented numbers? That training institutions are not meeting their trainee quotas? That the majority of newly trained teachers don't make it past 5 years in the profession? That there have been a number of shortage areas for years (maths, physics, MFL, chemistry...) and that this issue has not been solved by throwing thousands of pounds at so-called 'good candidates'?
Exactly where are all these 'good' teachers you are going to pay more going to come from?