Preworkout supss are not being banned, certain ingredients are. There are still plenty available without those ingredients, and seeing as though the FDA is banning those ingredients too, the US companies will just adjust their ingredients where necessary.
Ofcourse pw's have no nutrional value, never meant too. The main active ingredient in pw's since they were made has been caffeine.
Caffeine works, and is one of the most effective legal supplements out there, which is why every athlete uses it, and the IOC has a limit imposed.
However, I do agree, the avergae Joe doesn't need it. But it can help.