http://en.wikipedia.org/wiki/Wikipedia:Requests_for_arbitration/Daniel_Bran…
seems to disagree with your view that a speedy can be undone by any
admin. In fact, it seems to suggest that a consensus is required to
undo any speedy which isn't "obviously out-of-process".
"While undeletion policy permits admins to reverse an obviously
out-of-process deletion, discussion is the more appropriate response
when there is disagreement. The proper venue for such discussion is
Wikipedia:Deletion review. As a general rule, articles listed there
are left deleted at least until a strong consensus begins to emerge in
favor of overturning the deletion of the article, or are marked as
"temporarily undeleted" if undeletion is necessary so that
participants in the review can see the article's contents. Where
consensus is unclear, the article should remain deleted until the
five-day comment period has elapsed."
The idea of speedy deletion is that only articles where there is no
room for debate get deletion without debate. If someone (esp. an
admin) disagrees, then that is very clear evidence that the deletion
was out-of-process. There should be no room for opinion or judgement
in speedy deletions, so anything controversial is, by definition, out
of process.