While it would be fantastic for CS to do equal or more damage than rampage I doubt we will see that sort of adjustment for 2 reasons.
A) A huge boost to the Ftp required to make it do that much would also translate into it doing that much more while under brew conditions. Granted at the moment the best I've pulled off was a high of close to 30k, and an average of 18-21k in brew situations. That still puts us well behind wildfire which can almost one shot rani or shinryu.
B) I don't think it is realistic to expect such a large boost to the WS because the Beastmaster themselves are only 1/2 of the damage output in the equation. Our pets are putting out a significant amount also. In this day, and age skilled Bst are far more melee/DD oriented in terms of gear/playstyles. That allows us to close the gap with the #'s our pets are putting out.
So the tweak that needs to be made has to reflect Master, and pet combined. We only need enough of a boost so that we can at least measure up to an average DD's output when Bst/pet's #'s are combined. Hopefully we'll see a boost to the damage on CS to make it close to what we can do with rampage. That way we can utilize it enough to benefit from the aftermath, and make our available skillchain options more versatile. That boost, and some other added effect would be fantastic, and still preserve game balance.