Hmmm... That could work very well with the expanded timepriod and four seasons. The main problem with four seasons is that the players can in certain cases just blast ahead and win the game within 40 years if not less. That is just not cool at all. This way you are forced to fight at every step of the way. Added to the fact that you need a loyalty-generating garrison, it would take quite a bit of time to get going.

Of course, since RTW introduced the culture thing, maybe that can be added to this feature so that the free militia doesn't come unless you have less than 10% culture difference (and then only partially, with more at 5% and the full deal at 0%)? That way would recently conquered places be rather weak and in need of the professional troops,thus slowing down the impossible advances we have been able to perform.

I guess some would complain at this, that it would be too problematic. Well, would it really? Then each siege would be fun as you would need plenty troops to take the place, and it is always fun to slaughter militia. Further it would benefit the more deliberate attackers, those who plan out their attacks to the full and those who try to generate another 'home'.