Better Ideas for TH7 than Most
I agree with a previous poster about being seriously tired of this constantly being posted. However, it's definitely one of the better suggestions for solving this issue. I can definitely see a Giwipe being a very effective and more entertaining war strategy for TH7s than the mindless and guaranteed 11 Light Mass Drag 3* (yes it's guaranteed if you know what you're doing).
Regarding the progression of the game though, giving TH7s Pekkas and then TH8s Drags doesn't make sense - especially since the usefulness of the drag steeply drops once you're TH9 (it's like you forget you have them). Whereas, Pekkas only become more useful and important for key strategies. In that sense, I'd say no, let the drags stay at TH7 and enjoy the fun while you can.
Perhaps another route to consider is taking lvl2 drags away from TH7 altogether and rescaling dragon damage and HP such that you'll need to use something more in combination to obtain the 3*. At least then they're rolling some kind of a Dragloon or Hogs+Drags combination to obtain the 3*. For TH8s, only lvl2 is available but obviously scaled to overcome the fact that TH8 will probably not have LVL3s (too much research upgrades already). Maybe buff the LVL3 to at least attempt to make them useful at TH9 in some combinations.
Food for thought.