In the game, the mission Hack into Starbase Prime says it will end after 5 completions. On the wiki, it has a ? for next mission. Does anyone know if there is a next mission or if it does end?

It means no one knows, once you completed that mission, see if it ends or there another one, then update wiki.

I was hoping someone who already did the mission would know, because I'm focusing on other things at the moment, and was wondering if it was worth the time and energy to do the mission

When you click on the mission, if it says "this mission unlocks a new challenge" then there will be a new mission after.