Iowa has been doing a solid job of making the Iowa caucuses significantly less relevant all on their own. The state and its registered Dem and GOP cohorts have become much less representative of the nation as a whole over the last two decades.
The last time the winner mattered was, perhaps, Obama 2008. The contested races since have yielded the following winners: Huckabee, Santorum, Clinton, Ted Cruz, and Buttigieg/Sanders.
given current prices, is there enough incentive to grow food for export?
I guess if you want this to change, you've first got to stop Iowa being so ludicrously influential in the presidential election cycle.