mass adoption of the same series' of motor over an entire line-up will definitely increase the amount of parts that are available for folks to tinker with outside the GM models -- one of the big factors that lead to the success of the LS in the car-hobbyist sector was that one could find one at the nearest junkyard.
but, really, that trend started earlier with the 4" bore small block motors from 1962 onwards; the same family of engine the LS is from, anyway. They were produced forever, put in everything, and could be had by any hobbyist for very cheap from the closest junkyard.