There's every possibility that neither Voyager will ever arrive anywhere ever again. If they do, it's going to be after our galaxy collides with another, and the place they arrive at may not even exist yet.
While the Milky Way galaxy is on course to collide with Andromeda galaxy in 4.5 billion years, that will not make Voyager's arrival anywhere more likely, since the stars are far enough apart that they will not be affected.
My understanding is that it just makes it less predictable once that happens. We don't know exactly where all those stars are, and it gets chaotic once they start interacting.
It probably is a _bit_ more likely as well, you suddenly have ~2x the stars near you and some of them are moving much faster relative to you, it's just not a sure thing by any means.
Well so would be picking up radio signals like the ones we emit.
And while the probability that someone will be able to pick these signals up is low, it is still almost infinitely greater than that of someone finding one of the Voyagers out there.
