I don’t think there’s any reason to be concerned until we get more information. At this point, we know that Paul Wesley will join SNW in season two as James Kirk. The bars on his sleeves do suggest he is a Captain though so there is that and the official picture shows him in a command chair. We have no idea how, if he’s a regular, a guest or a recurring character. We have no way of knowing if he will be the Captain of another ship, be visiting Enterprise for an episode or two or for an extended period or if he will be joining the crew, either as crew or in the command structure or leading the ship.
While being preemptively upset at something is a trait of Star Trek fans, I say we buck tradition, enjoy season one and be patient as we wait for more information on what Kirk’s role might be here.