Well if the tiebreaker is CP then the new Dragonite will be Dragonite and Tyranitar. All level 34 players will need as many of these and only these maxed out since they cannot be in a gym longer than the same level players with the same mons. They will have to be maxed out. And you won't have as much dust to spend on other mons since high end leveling is so expensive.
So level 26 guys can just give up on working their way up in high level gyms through wise investment and good mons?