If it were more attractive to remain in areas other than London, there would not be the influx or people from the provinces who hope that the streets will be paved in gold.
If there were decentralisation, there would be more work for those outside London so that they can be successful in their own area. with less pressure on the infrastructure in London and the South-East, things could be better for those living there, too.
Airing your views to local government does not help them to redistribute what they do not have, or to attract business and backing away from the magnet of the South-East.