I think the answer should be yes.
In the beginning the revolution mechanics aimed to be a compromise to represent the late emerging nations that rebelled against European civs. Now with the complete introduction of these 19th century nations, not only the revolution mechanics need changes but also do the old European civs.
For example, the US and Mexico revolution should share same or highly similar features to their own civs. Their current look far from their civs’ flavor. If the player use the British/Dutch/French/Swedes to revolt to the US, it should share many US units and features just like the Texas revolution of Mexicans which has Regulars, Volunteers, Marines instead of Redcoats, Ruyters and Hakkapelit. Likewise, if the player use the Spanish to revolt to the Mexico, it may be able to use Padre, to build Hacienda, to train Soldado and so on to improve the consistency of the Mexican theme.
Secondly, to the revolution mechanics themselves, I suggest to make them available in the fortress age, 1 age earlier. It can use the revolution as an aggressive rush more easily. If the player does not want to wait and choose to revolt just in the fortress age, it would cost cheaper than in the industrial age but also would supply less benefits, such like making some powerful cards unavailable or giving less military units and resource crates. They still cannot return to the original European nations after revolting so the fortress age revolutions will be a more risky, courageous and powerful tactic.
Another problem is, the revolutionary new civs are obviously focus on the 19th century, while many old civs are still stuck before the 17th century. In addition, compared with the new civs, the old ones present insufficient cultural and historical characteristics and accuracy. These are quite the issues that need to be dealt with. Some innovations to old civs are more satisfying to the community than introducing new ones. For example, the British should have the opportunity to put down their longbow and pick up their rifle, the traditional Turkish composite bowmen should be the archaic unit at Ottoman barracks, the Chinese and the Japanese should have a way to acquire the own modernized military units in the late game, etc. These issues also bring weird experiences to current revolution mechanics, such like the US use longbows, while the Mexicans use lots of pikes and crossbows. Even be the opponents, the Mexicans’ use of advanced firearms to defeat the Spanish rulers with archaic weapons is out of place.