router syn/syn-ack/ack alarming...

um... maybe i'm missing the clue here, but if the router vendors add
something that shuts down an interface if the SYN/SYN-ACK/ACK ratio
becomes too bad make it *easier* for me if i'm doing a denial of service
attack on a host?

instead of denying service to a given host, all i have to do is drive
the router into alarm mode so it shuts off the interface and then i get
to deny service to an entire segment and everything downstream from that

here's to better bang for your cracker-kiddie buck...