Elixir on Wall Upgrade: Terminate, Continue or Continue with Conditions
Terminate: benefits more to active players. Motivate players to stay active and raid more.
Continue: benefits more to semi active players. Encourage semi active players to only collect resources from collectors and dump mostly all resources for wall upgrade.
Continue with conditions of there are still balance of minimum 4 million elixir in storages after any wall upgrade: benefits to all players. No wastage of overflow of excessive elixir in storages. No poor economy as players cannot dump all resources for wall upgrade. (This will be a solution in long run.)