Many times shortly after a symbol change good things begin to happen with a stock. It is a way of "shedding" their old name and starting over afresh. For one I am glad I grabbed a few shares! The symbol change will be a good thing.
Why would a dormant company that had no plans take the time and effort to change their symbol? They would not!
Before you criticize a man, walk a mile in his shoes. That way, if he gets angry, he's a mile away and barefoot.