Do you really want a lesson? Here’s part one for free . . .
When capitalism and art wed, story-telling became a ‘for profit’ endeavour. Bean-counters using spreadsheets determined what would sell and what would not, but they needed data to inform their decisions, therefore they invested in the likely success of what had come before. However, rising production costs forced the US to face an international market. Hollywood went bust in the 80s and needed international finance. Outside of the USA nobody cares about the whole ‘cowboy’ thing so Westerns died overnight. At this point, the continuing celebration of US military might was not going to fly with the investors (largely German). This explains why “Top Gun” (1986) is the last of those films. It also explains why "I,Robot (2004) seems more like “I’ Audi”.
Whilst Hollywood attempts to reboot whatever worked for the last generation, the struggle continues.