Not so. As more agents learn that competing against RedFin agents is more difficult than it should be, they'll join in with RedFin. As more people learn that RedFin-style home buying works for them, they'll make RedFin a key part of their next home buying experience. I know I have, twice already.
The down-stream network effects of this are likely more significant and harder to predict, as real estate is way slower than hailing a taxi. Think desegregation.