I agree. Sometimes I have landing pages with links to new products on the main website that do not go live until a Saturday or Sunday and so we have to do weekend work to publish the landing page!
If the landing page is not approved, I gather the link to it is in advance ? It means that if a visitor clicks that link before the page is approved, he is redirected to the fall back page. Not good...
So the way to control this is to make sure that the inbound link in not active before the due date. Usually, this activation will not happen in Marketo.