I'd say they are continuing to expand/increase in most of the parts of Texas I'm familiar with. Here also, they seem to occupy a not-quite-wild niche and are much more common around human settlement; towns, feed lots, grain elevators, etc. Virtually all of the collared doves in my town are "pale tan" in coloration, but I've heard mention of the very pale ones.
If it turns out that they don't supress numbers of our native doves and pigeons, I kind of like 'em.