I may be biased, as a LEGO fanboy since the 80s, but I'm pretty sure the simple reason that complicated builds are more expensive is because they have more parts. Plus we've gotta remember that <insert that tiresome argument> sets are designed for Junior. Though I know we do, most ten-year-olds don't want to spend an hour brick-building their castle walls before they can role-play with 'em.
What's a change that I think would rock the AFOL community? Discontinuing yellow heads.
Would TLG dare? I'd guess the basic yellow smiley is so iconic, so much a part of the LEGO brand, that they'll always keep it around. But in my opinion all-fleshy would be alright. I honestly thought long and hard before buying the Imperial Flagship, knowing that Pirates of the Caribbean was coming. To me, lemon-heads look so... sickly, by comparison.
I don't mean to hijack this thread (so please don't rant), but what if TLG swapped all yellow heads to a mix of nougats, to correspond better to the world's diversity of skin tone? I think it would change LEGO forever. Would it be for the better?