the newer seasons aren't terrible guys, give it a shot and watch some of it.
btw, what will they do when the voice actors eventually pass away?
There are three options:
- they permanently retire characters, like they did for Phil Hartman and Marcia Wallace.
- they replace them after a suitable time, like they did for Doris Grau whose Lunchlady Doris stayed out for 10 years.
- they replace them immediately if they are too important, which they haven't done yet. (Tress MacNeille did do some Lunchlady Doris scenes immediately after Doris Grau's death due to timing)
Looking at the ages, it is clearly Harry Shearer who is the risk. But they have already looked at replacing him after the payment conflict and they could get away with reshuffling those characters. Julie Kavner is 66. She has way less characters but is also more difficult to replace as Marge/Patty/Selma. Azaria, Castellaneta, Cartwright and Smith are in their 50s so they should hopefully be available for decades to come.