New Idea for town hall

Everyone has seen the bases that have lvl 2 walls and town hall 10 also known as town hall hoppers. To give the people who have skipped town halls without thinking or just being an imbecile Supercell should give an opportunity for those ppl to go back a townhall deleting all the stuff they have earned during that townhall. Bbbbuttt this can only happen if they dont upgrade buildings to the Th lvl their required to lvl them up. All the buildings for that town hall will disapear. but this should cost half of the cost of upgrading the town hall but like 1.5 - 2 the time to go down the townhall