In reading this question (Would more throttle when using reverse thrust reduce stopping distance?), it prompted me to remember that on many of my flights (typically on 737s or CRJ type aircraft), it seems that thrust reversers are used for a few seconds after landing, but then are deactivated while the aircraft is still rolling at high speed. The pilot then utilizes the regular brakes to slow down to taxi speeds.
I am wondering why the pilot does not continue to use thrust reversers down to approximately taxi speeds, to reduce the amount of brake usage (and heating of the brakes) needed. My only guess would be to possibly avoid the reversers kicking up FOD back into the engine inlets at lower ground speeds, but not sure if that's the real reason or not.