Looks like part 135 guys will get the shaft, as no 121 street captain options will be available to them if they need 1000 hours in what I am assuming is 121 operations.
135.243 requires an ATP for turbojet ops or planes with 10 pax seats or more or if it is a commuter operation under 119. But there aren't many street captains in the US except for start ups and they usually look for pilots with time in type which they most likely got at another 121 carrier.