The saddest thing about selection by mortgage is that there is just not enough impetus to break the hold it has. Those whom the system benefits are content to be complicit in maintaining the status quo. That's some parents, policy/decision-makers in local government, and estate agents.
League tables cannot, now invented, be un-invented. There may be something less rigid as the Lib Dems want. Or they may be scrapped altogether. But "unofficially" everyone will still know which are the "best" (i.e. most middle-class - come on, we all know that's what people mean) schools. People want there to be badly-performing schools, and schools with bad reputations, so that they have bogeymen and know where not to send their kids if they have a "choice". There won't be a sea change - influential parents won't let it happen.
Estate agents would have an absolute fit if there were to be a ballot /random system round here - it would screw up their stupid mark-ups on prices in the "good" areas, over night. So they won't let it happen either.
In the city where I live I find it hard - indeed, impossible - to believe that the movers and shakers have a genuine commitment to making comprehensive education more fair and equal. Because that would mean mixing the intake from the schools where their children go, and where their friends' children go. And you can bet they are the best ones. So they won't let it happen either.