If and when this happens there may not even be people on Earth. We may be extinct. Stephen Hawking recommended before his death that humanity's best chance would be to spread out to neighboring stars.
Colliding galaxies are nothing to worry about though because the distance between stars is so large, when galaxies collide not many stars even pass close to stars in oncoming galaxies.
Recently there was a correction to the estimated size of the Andromeda galaxy (our first collision) by over a factor of 10+. Turns out that our Milky Way will absorb Andromeda and not even burp.
It would be a beautiful sight to see approaching in the night sky; the two galaxies in the shape of an X before they merge however who or what will see it all those millions of years in the future? I'd like to but for obvious reasons that's impossible. I'll be long dead.... lol
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