yes it will
Tickle my balls and call me skippy that was a quick answer

Would it be viable in that instance then to shutdown the L4D servers but have a system whereby if requested they can be turned on, thus freeing up bandwidth to use on the TF2 servers allowing for a slot increase or another TF2 server altogether (Assuming the current influx of players continues past the free weekend)
A quick glance shows only half the L4D servers currently being used so in theory you could use the bandwidth they are using on TF2 instead?