Middle-earth What-ifs

[Belegorn]

Yea I think in the end his best route would have been to unite the realms through his son since he'd be the son of the queen of Gondor and the king of Arnor. Still Arnor was in dire straits at this time and Eärnil ll was actually cool with the rulers in the North but he didn't have any manpower to send since he had his own problems. I suppose there might have been a way to prevent it, but it might have been too late since it appears like the time to actually do it was with Arvedui via prophecy.