Upgrading walls with elixir in th8

Supercell please include the feature of upgrading walls with elixir in TH8 also. As I have observed and concluded that as a player becomes TH8.5 , he has his elixir storage full most of the time. And after upgrading those elixir troops and all the barracks to th8 maxxed level, elixir is totally a wastage and also attracts many players of th9 for loot. There is no meaningful use of elixir at that point and goes on till we become TH8 maxxed and move to TH9 . We also struggle a lot to collect gold to upgrade those walls. If it seems that it will be too easy to upgrade walls then u can increase the cost to 1000k, then it will be a little balanced.
Please Supercell make this change in the upcoming upgrade of coc. I am really very excited about clan challenges.
Please friends share your feedback on my suggestion.
Thanks

if lvl 8 walls would cost 1 million how much would a lvl 11 wall cost? 8 million?

This was put into effect last year and failed, it made the economy in the game horrible(as in nothing left to loot during raids). This will not be put into place because then you will come back and complain that you can't even raid enough loot to put elixir into the walls.