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Banned
To be honest, after musing on this I have speculated that the getting back may be the least ASB bit of such a contact. Given that this means the initial crossing was survived, the sailors now have a rough idea of how large a distance they are dealing with. And any Roman sailor who have sailed in Britain will know about the westerlies.
So if you got sailors who have sailed around Britain, you got a rough idea of how much you'll need in provisions, and a weather system to aim for.
That doesn't mean their odds are good, but they are far better than they were coming the other way. However, nothing there will motivate them to come back. I am not sure how much gold the mesoamericans were producing in Roman times, and I can't think of any other motivation that would lead to the kind of sustained effort this needs.
Well, unless we see an Emperor consider colonisation for the sake of prestige, whilst probably better to invade/colonise Germania for that purpose, an Emperor in the west may well choose to do so rather than move the Limes.
It is a way to get rid of rivals, and means that unless/until they hit natural limits (i.e. the Appalachians) they have new Soldier/Farmer land to give away to make their armies cheaper. Chances are you'd defacto have three Roman Emperors by the end of it, but if an Emperor knows this land exists, then it could be used at the first opportunity.
After its discovery, if there is the most basic presence in the new world - we could see Emperors forcing the break up old Senatorial Estates to smallholdings in Italia, in exchange for vast tracts in the New World, we see a tax problem in the WRE reduced, with the offering of new lands able to soften any opinions of tyranny.