It's probably a good choice to end it. 25 years is a seriously long time, and she may as well end while she is on top, rather than wait for things to (possible) decline. It's like a retirement.
The audience was only there for the handouts.
"Everybody gets a schoooooool!!!"
"You get a school!"
"You get a school!"
"You get a faculty!"
A member in the hand is worth two in the bush.
Ellen over 'the doctors' cakeheads any day ........
Now we can look forward to 3,724 episodes worth of reruns.