Why misguide ? If Gavin makes a change and nodes do not update accordingly, it'll simply get rejected. That is called concensus.
This. OP your argument doesn't make sense. We all have control of whether or not we want to implement the change. The core 5 have almost zero power to do something that would hurt the community. If they update the code to allow them to have a million bitcoins each, no one would adopt the new software.