Future of 480

I was talking to an avionics guy the other day who was turning people
away from the 480. His reasoning is that Garmin orders the required
chips in bulk lots and once they are gone they are gone. Since the 480
install base is smaller than the 430/530 and since it does not seem
that Garmin wants to move the 480 software forward (all subsequence GPS
units have been based on the 430 software) he believes that at some
point 10 years down the road, chips will not be available. He said the
same will happen for the 430 but it will take much more time since
there is such a large install base and Garmin has more of an incentive
to order additional production lots.
Does that make sense?

-Robert