So it turns out that the Equestria everypony had known wasn't quite real. Yes, the lives they lived, the friends they made-- those were real, at the very least... but many times, the end only brings about a new beginning.
Nopony knows this better than Twilight Sparkle.
It only takes one moment, one decision. After all, nothing can last forever.
Nobody knows this better than Lisa Garnet.
The past made way for the present, which makes way for the future. The things we love come and go, entering and fading from our lives on a constant basis.
Decades down the road, the time has finally come to retire Pony-Me. The process to shut down the network was meant to be quick and painless to those unfortunate enough to live only as AI. Lisa and Twilight, once upon a time, had agreed to this, each knowing that eventually, as all things do, Equestria must end.
But maybe... just maybe, there's still life yet to the old machines.