So what exactly were Sprinters and Pacers built to do? Were they built to transport people in luxury from one end of the country to another, or were they built to get you less than 100 miles cheaply?
One could argue that in some instances, pacers were built to run rural branch lines but have ended up running some busy inter urban services that they aren't particularly suited for.
That said, a lot of these issues could be solved by introducing enough stock to be able to strengthen/double the pacers rather than scrap them (particularly true of the 2 carriage 144 diagram on the Hallam stoppers where most are 3 carriage for example).