As it's been said, you can't say that the PSP's demand is going to exceed the DS Lite's when you need just as much of a miracle to find a DS Lite as you do a Wii at this point. To date I believe 4 3rd party DS Lite titles have hit 1 million+ sales. Dragon Quest Monster Joker alone keeps going on and off the Japanese charts due to the fact that the cartridges aren't being produced quickly enough, if it had a plentiful supply it may have been able to reach near 2 million sales by now.
Nobody is crazy enough to accuse me of being sane.