Fair… I am not as familiar with bike industry as I am with cars… (I start getting into bikes just 5 or 6 years ago).
But my point is…
a 2013 cervelo p5 is as capable now as many newer bikes with they fancy electronic shifters and disc brakes…
but a 2005 bike probably is not as capable as a 2013 bike.
My point: the bike industry is getting to a point where gains are marginal but prices are sky rocketing.
People will probably keep their bike longer now than years pass.