I think it's the transition thing that's worrisome - people who haven't done this before would not welcome more Thai bureaucracy and paperwork (all the more so when it could cost them), and what (if any) adjustments should be made. it's that uncertainty.
Same thing, whenever they introduce some new immigration hassle - a vague notice, people get upset and worried, relevant officers clueless and the whole thing takes time to get in gear, then either stays or scrapped. Once ironed out, it's less of an issue, until then - depends.