I doubt if farmers (at least in Indiana) are going to pay for bees unless there is undisputed evidence that it will make enough in yields to pay for the bees AND Make more money per acre.
Then again why would soybean seed companies want to make a soybean that relies on bees?? That would also be more weather dependent.
There are a lot of studies being done to get to a self pollinating almond tree, wich may be a few years down the road! But until then they rely on beekeepers to supply bees, which relying on someone else besides themselves to produce a decent crop.
Most Farmers planting soybeans will not want to depend on someone else (that has no investment in their crop) to bring bees in.
How many hives per acre would it take to make a difference? And that's if they don't choose something else besides the beans.
It is my understanding that where the almonds are there is nothing else for the bees to pollinate, so the bees have no chose.