First, whether the Strokes were ever "indie" since they were never on an indie label and their debut single tore up the MTV/radio charts is questionable. Second, even if they are "indie," they are a different musical style of indie music then DCFC, BSS, Bright Eyes, or any of the other bands people are saying got popular because of them.
O.C. Rock or Braff Rock DOES NOT share a sound or a fan base with the Strokes. If there were a ton of Mooney Suzuki-esque bands that prospered from the Strokes, then OK, but there aren't. In fact, if you want to argue the record that most and first made OC/Braff rock accessible to the pop masses, it's the Postal Service record like I said.