So, you could pay attention to bringing all comps up to standard and give everyone a good education, or you could pay attention to tearing the whole system apart building new separate schools to be grammars, and go back to a different way in which to under-educate some pupils!
And if you believe that it is bright kids who already get a good education in comps, then why is it grammars that are needed?
In a comp the best teachers get spread across ability bands - do the best teachers apply to secondary moderns? (I genuinely don't know). Do the best teachers apply for grammars, or do the teachers who only feel able to maintain classroom focus in a motivated achieveing class take refuge in grammars?
So many assumptions are made.
The VA scores suggest that the low and middle attainers in many schools do actually get a good education in relation to their potential.
And if the neighbouring grammar didn't suck up the top 25% perhaps the local 'comp' WOULD actually be a comp.
Good comps don't have to be in high house prices either. London proves that because the micro-climates in housing ensure that any catchment will have million pound private houses and high density LA housing. Though I do recognise that it is different outside London.
I'm not saying that there are no issues with getting a good education for all, but am not remotely convinced that 'bring back grammars' is the best way to solve the existing problems.