First, the event horizon doesn’t work that way. You will never see what Andromeda will look like a trillion years from now, but in a trillion years, you will see Andromeda. It’s just that you’ll see what it looked like a long time ago. You will eventually get to the point where it’s too redshifted to see.
Second, the universe won’t be able to support life forever, so it can be assumed that we’d exist before it gets to the point that it can no longer support life.
First, the event horizon doesn’t work that way. You will never see what Andromeda will look like a trillion years from now, but in a trillion years, you will see Andromeda. It’s just that you’ll see what it looked like a long time ago. You will eventually get to the point where it’s too redshifted to see.
Second, the universe won’t be able to support life forever, so it can be assumed that we’d exist before it gets to the point that it can no longer support life.
It will merge with Milky Way in a few billion years. It will ceased to exist as an independent galaxy nearby.