Smallville's two founders, screenwriter and producer alfred gough and Miles Miller, will leave the set together after the seventh season. The eighth season will be replaced by some producers or directors from previous seasons of smallville, so the story style may not change much.
Personally, I think that because alfred gough and Miles Miller swore an oath, CK in smallville can't fly or wear a shirt. Now the eighth season has arrived, as the plot points out, CK has reached the last moment of "pre-Superman life". Therefore, their departure this time may indicate that these rules will be broken, otherwise smallville will be unsustainable. Although on the surface, it won't be said that this is the reason why they left, but God knows, this may be the most respectable and safest way. )