"If the official price is lowered then that promotional price will be lowered....duh."
That's pretty direct if you ask me ;P
Your assumption goes against the status quo. Mine goes with logic, so therefore the burden is on you to provide evidence to backup what you say.
It would be a logical assumption to state that if the base price of a console is reduced, then any other promotions on top would result in a lower price of the overall package. To say otherwise is lunacy.