Barbarian and Archer Upgrade
Since Barbarian and Archers are the basic troops of Clash of clans, they should be upgrade able according to their Townhall.
If one has level 4 townhall, he or she can upgrade their archers and barbarians to level 4, for those who has level 7 they can upgrade their barb and arch to level 7. And yes their production cost elixer should be reduced too. All the Clash of clans updates are for higher level players only. this might help the low level players to get and extra attacking boost. And as they are getting maxed archer and barbarians at town hall 7 their stat should be reduced and more upgrades should be avail able for barb and arch(max level 10)