They won't write any better with VSL or the Berlin Philharmonic at their feet, that's the point. They worry about the mix instead of how rueful their compositions are. They're in the wrong profession these people, perhaps they should become mixing engineers... Why are they so obsessed with so-called realism instead of being obsessed with music? Because it's easy to demand the former from developers and engineers; they'd have to take 10 years off their middle-earthen lives to learn about the latter though.
If we're to be honest, what they're after is not the "Hollywood Sound", at least not most of them. They call it that for they don't want to call it something else - like the "Clones' Sound". For let's say that today's computer/samples technology was available 15-20 years ago, and people were trying to get their mixes to sound "Hollywoodian" then too... What would the right paradigm be? What was the "Hollywood Sound" back then? Was it Basic Instinct's? Dancing with Wolves'? Saving Private Ryan's? Edward Scissorhands'? Titanic's? Even though these scores were recorded and mixed specifically for Hollywood, they sound pretty different to me (not just compositionally - but could the perceived sonic differences themselves be epiphenomenal due to the great heterogeneity of the actual compositions?)
In short, these people today have as their specific and primary goal the emulation of other people's music (say Hans'), to the point of indistinguishability. They want to contribute nothing themselves (well, they couldn't...), but they can't even get that quite right either (that's how numbingly hopeless they are), which is why they persist in covering all bases so to speak, asking for symphonic forces that have been sampled with the right kind of frequency responses, ambience, etc. If they could, they would ask for recordings of 2-4-minute, fully orchestrated generic chugga-chugga passages. What am I thinking?... Dan, great money opportunity here!...