Shortpoast here: for those who learnt about the Milkomeda from Alastair Reynolds, this is not a certainty. nbody dynamics are hard especially if we don't have a handle on the true masses - and distribution of masses - of the bodies. We do not actually KNOW if our galaxy and their galaxy shall meet n' mingle.
And since most of our masses are dark matter, and we still have less than no clue what dark matter is (or if it is), how Galactic-scale interactions express themselves is another factor. I think.
Now, Reynolds works within fictional constraints which is to say, constraints he invents for intelligences higher than Reynolds'. So we'll allow it where we might not for, oh, Currents of Space. If you are a SF author and not as bold as Reynolds, I advise keeping this merger off your "hard SF" prophetic lore. If you feel as bold as Reynolds, feel free to say "screw this" and use some FtL Drive anyway.
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