If xbows were legalized in some states and gun hunters turned out in droves to use the xbow during archery season, deer numbers would decline, therefore resulting in either restrictive limitations, shortened seasons, or banning of archery season all together. Xbows could potentially be the downfall of archery season as we know it. It all depends on the response from the gun hunters.
Sorry I don't buy that for a minute. Arkansas has made crossbows legal during archery season for several years to my recollection. There haven't been any of the above effects on the herd or on the archery season.