Take a look at how Pentax is marketing their new K-30. http://www.pentaximaging.com/dslr/K-30_Black#!product-support
There are a several of interesting points here.
Oftentimes on this forum, I read comments that imply that the only thing average consumers care about is more and more megapixels. That other features don't matter. But, really, people care about megapixels because that is what manufacturers told us to care about during the early years of DSLRs. It made sense at the time because the technology was developing rapidly and the sensor advancements from generation to generation were significant.
Now as the technology matures and resolution becomes less important, manufacturers are looking at other features to differentiate themselves.
This is an interesting choice on the part of Pentax.
Of course, it's also interesting because of the bar it will be setting for Canon, Nikon, Sony and Fuji. The K-30 competes against the 60D, so will Canon respond with some weathersealing on the 70D? At a minimum, the 7DII will need some serious weathersealing to justify the price differential.(As an aside – when I saw the ad, I wondered what their legal department thought. The ad visual certainly implies that the camera is virtually waterproof and the copy even talks about sand and beaches. It's either incredibly well sealed, they have a generous repair policy or they are prepared for a heck of a class action suit. )
I've never thought that much about weathersealing. But as with any successful ad campaign, this one certainly caught my attention and got me thinking about the advantages of full weather sealing. Now I want it in the 7DII and I didn't even know I did. Good marketing.
The point here is not to turn this into a discussion of the pros and cons of weathersealing, or to do a big comparison between the various levels of the current 7D, 5D and 1D, but to point out that the conventional wisdom that drives many of the discussions on this forum can be quickly upended by what happens in the marketplace.
61 point autofocus...gotta have it; 256,000 ISO...gotta have it; more dynamic range...gotta have it; etc. etc. Marketing raises the expectations. Competition raises the bar. Consumers get a better product. Gotta love capitalism.