Hi there,
As far as I know there is no specific Scheduled Job (nee Cron Job) for "Future Remaps", and in any case, existing asset lookups override any remaps for the same URL.
There are "Future Lineage" Scheduled Jobs which can let you delete and create links at a certain time, but I can't think of any easy options (doubly so if you're on an earlier version than Matrix 5.1). Most difficult would be to ensure the two scheduled jobs you'd need would run in the correct order, to avoid a "web path already exists" error. I'm not sure if there is any guarantee on that.
In Matrix 5.1, you could set one Scheduled Job to delete the link, then attach a trigger to that link deletion to move a new asset into the same place (using the "Action on Other Assets" option brought into 5.1). In both cases you'd have to make sure the web path of the new page is correctly set.
Does it have to be a different page (and URL) that it goes to? If you want to use the same URL, you might be able use Future Status jobs to switch which content containers get shown to the public after a certain time, replacing the form with a "sorry we're closed" message.
If it has to go to a different URL... I can't remember, if you have a Nested Content content type that contains a redirect page, whether that redirect gets honoured. That might be another option, but I am ready to stand corrected on that.
Just throwing a few possibilities that might work, but in the end it unfortunately doesn't seem to be a trivial thing to do through Matrix itself.