With so many new events happening or being prepared for within Genesis, there were many people talking. The news of another race joining had already stirred things up since many people had been interested in the races who came from the elemental planes.
It led to many people wondering how many other races might appear seeking new homes. Not that they didn't want to welcome them in to the alliance and the city. However, it raised questions about how many races might eventually come to the world and if they would all be safe to ally with.
To be fair, many races were used to fighting for their lives constantly within the elemental planes. Hence why the risk of them being dangerous reached the minds of those from the world entirely.