On mining pools all miners get rewarded with the analogous CPU they have used.
I don't know exactly how many satoshis will be generated on every block after 2100 but I know they will be very few. Imagine splitting 1 satoshi. How? Will the bitcoin community create the nakamotos?
1 satoshi = 1000 nakamotos for example. Too dumb question, tho, since we can't know a damn thing about that era. Some say that life will end after 2100 due to loss of natural supplies.
Many will still mining to maintain the blockchain but your subject is too far away. There is still 80 years left for this to happen and the future will tell whether it will happen or not. Where many people do not believe in cryptocurrency. We definitely want Bitcoin to reach the top of popularity. I believe that mining pools will exist after 2100.