Trekkies are necessary. Statistics have proven that their are more Trek Nerds that there are SW Nerds.
Trekkies make the rest of us in the world feel better about ourselves knowing that we aren't one of them.
Statistics have also shown that in in the early 24th Century, Star Trek will become its own religion and cover half Earth's population, and will create and all out war with Buddhists, who will take up the other half.