Actually, after release of the LGA 2011, I think that the LGA 1155 gen 3 mobos are the enthusiasts choice. Yes, you can outdo the LGA 1155, but only marginally and at a poor cost/benefit ratio.
For those whom "money is no object," it is great to have a $15,000 build with the fastest CPU, RAM, and more bandwidth in mobo lanes to achieve bragging rights. However, even serious gamers are usually constrained by budgets of under $3,000.
LGA 2011 is more for server builds and those few who may indulge themselves in conspicuous consumption (bless their hearts, I'd love to do some builds for them). But, your observation about the mainstream is, I believe, wrong given the power of the Sandybridge platform, the coming Ivybridge, and the budget constraints of most builders.