It's a nice suggestion, but in all honesty it's not really necessary. The amount of dead threads that get resurrected, on average, is fairly small -definitely NOT enough to warrant closing all of the older threads. If people would read the rules before going on a merry posting spree, things would be easier, but we all know how much THAT is done.
Also, Marcel_C, there is an unwritten policy around here that says, "if you ask to be a mod you will never become one." Just some friendly advice.