I think the decade saw your average theme park guest become more sophisticated and informed (helped with the rise of the internet)...The average public became better informed consumers. Visitors to parks expect more from new attractions...they expect a rides to be smoother, more reliable, better themed, etc.
The parks have also expected more from the ride manufacturers. With increased technology (computer aided design and manufacturing), and new construction techniques, the parks expect nothing but the best and will not tolerate anything else.
I may be way off on this, but its just my observation