Note that we only can't handle automatic demotion. Users can always change their state manually.

doc/spec/proposals/ideas/xxx-automatic-node-promotion.txt

@@ -60,11 +60,11 @@ Target:
    Auto-bridge -> relay: Tor has detected that it is sufficiently
     reliable to be a *relay*
 
-   Note that this model does not support demotion. If this is
-   desirable, there should be some memory as to whether the previous
-   state was relay, bridge, or auto-bridge. Otherwise the user may be
-   prompted to become a relay, although he has opted to only be a
-   bridge.
+   Note that this model does not support automatic demotion. If this
+   is desirable, there should be some memory as to whether the
+   previous state was relay, bridge, or auto-bridge. Otherwise the
+   user may be prompted to become a relay, although he has opted to
+   only be a bridge.
 
 3.x User interaction policy