Brent, if the population is in check and numbers are where they need to be, then yes there may be no reason to change. I'm just going by what I've heard.
I find the thought of shotgun only to be very backward and a means to limit the deer harvest through limited firearm range. Of course I have grown up in a different state, where centerfire rifles are .22 caliber with 55 grain bullet and up, inline and traditional muzzleloaders compound bows and recently crossbows. The harvest numbers seem to keep going up. In some locales the numbers are down either to disease or a poorly thought out deer management program for taking additional does off of larger parcels of property.
Regardless, we have always had rifle deer season here and the thought of removing rifle season here just sounds absurd.
Most game laws and changes in regulations are political in nature and have minimal basis in logic or good stewardship of game in mind. I don't know why shotgun only was initiated for your state.
Here, shotgun hunting of deer is legal with slug only. No buckshot is allowed (illegal) and most consider it unethical as well.
We are just from two different hunting cultures, somewhat polar opposites if you will.