Even a "we will eliminate the Arcade and offer the Pro at that price" would take away momentum from a PS3 price cut announcement. I think they just want to postpone or "endanger" any decision sony makes about when and how much.
You consider it fear, I think it's just maximizing what you can do to get more before the competitor tries to get back.
Fear would be (in this business) when MS would try to bomb the PS3 factories >_> (imho :p)