Does it close after its captured all of the Kandorians and Kryptonians????
What if there were other Kryptonians on Earth who were/could have been transported?
And Kara? Would she be on earth yet?
Did Clark even think about this? For all he knows, he could have transported his cousin away!
Also in Season 10, (i know Kara was trying to destroy "the darkness" by herself) she could have totally helped out Clark out of a few tricky situations after that 'Supergirl' episode.