I think the best you can do to achieve the desired result with the footer approach is to inspect the document to check the table actually appears on the last page and, if there's insufficient space for it, insert a manual page break at a suitable point. That said, it would look rather odd having an otherwise blank page with a table at the bottom of that page. Accordingly, you might do best to insert the table into the document body and let Word position it immediately after whatever preceding text you have - it's easy enough to ensure the table doesn't break across a page boundary.

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]