I am a large FIM holder (from IPO) and I even I think it would be nice to have incentives for smaller FIM holders to get involved.
We'll think this through how to arrange it, but it's very difficult to do without skewing the incentives towards unfairness.
Bonus rewards are not paid very often, so random variance will play a big role and even small time forgers have a considerable chance of hitting the bonanza on one of them.
Rough idea: Divide the reward with the forging account's balance and use that as a factor. Additionally have a maximum cap for revard, like 10000 now. This way anyone with 10000 or less would get the full reward 10000. Account with 50000 would get 10000/50000 times 10000 = 2000 etc. Simple.
The 200 FIMK basic reward would be paid in any case for the extra rewarded block like for any block. So an account with a million would get the usual 200 + only 100 extra. But an account with a million on it will forge like what, 600 000 a year was it?