The price discrepancy isn't that bad in many other parts of the country. But everyone has to figure out for themselves whats "worth it." For me I'm fine with paying a little extra for diesel fuel because of the efficiency/range advantages and driving characteristics. And when you take into account that some of these newer turbo and Hemi gasoline engines recommend 89 octane or better, the price difference for diesel isn't that much more, if at all.
I'd be surprised if Ford doesn't introduce a diesel option. The groundwork has already been laid: they have a handle on the emissions technology with their 1/2 ton's and 3/4 ton's. The 3.2l inline 5 is already used stateside in the Ford van. GM's 2.8l diesel has been selling well enough, and it seems that many companies see the potential for consumer demand. Why else would Jeep, FCA, Ford, GM and Nissan be introducing diesels into market segments which previously lacked them?
PS: Also, I'd like to know where you're regularly finding unleaded gasoline for $1.99. That's far lower than the national average, so it isn't really a good basis for comparison.