When my wife's ML320 turned 100k miles, I took it to my local Indy to see what he suggested needed to be done. I asked about the transmission fluid, and he said it has lifetime fluid. I asked the gentleman, who I guessed was in his late 60's/early 70's, if it was his lifetime or my lifetime. He got a good laugh.

The point being, some people keep these cars for a long time, some keep them until your lease is up. If you're going to have it for a long time, treat it like you want it to last.