At the risk of raining on this parade, my guess is Alastair Tait could be engaging in some wishful thinking in his column. The R&A has had 150 years to bring the Open to Wales and to Royal Porthcawl and they have yet to do so. Why start now?
The situation at RP is not at all similar to Merion, which hosted multiple US Opens thru the years, but was dropped from the rotation. RP has never been
in the rota. You could make the argument that the situation with Royal Cinque Ports, which has hosted Opens, is much more similar to Merion than Porthcawl.
On the other hand, maybe Mr. Tait knows someone in the R&A who knows way more than we do.