I see it the opposite way really. If you're going to revive a map, then it takes up a pending slot and for some, they are invaluable as you can't submit when it is full. Isn't that motive enough to be serious when reviving a map? In other words, I don't think 'being serious' really matters in this case since you can look at it both ways.
And the request is to have it on the submission page. If you think about it, you are already submitting it, so why would this 'reconsidering' thing even matter? If I'm going to revive something, I'm going to revive something, these extra clicks/pages aren't going to change my mind.