I had a wonderful day at Deal on Monday in a 3-club wind, with the course running for miles. And we had the added excitement of dance legend Len Goodman playing behind us. Apparently there was a fair bit of restorative rain on Monday night, which the whole SE of England desperately needed. RCPD is unquestionably one of the best places for a game of golf in the UK.
Nonetheless I am willing to bet that Deal won't host an Open in my lifetime (I am now 63), and nor will Porthcawl or Saunton - neither of the two last being quite long or tough enough, in the end. This is a GCA thread that resurfaces in various forms every couple of years, but I think we have to assume that
The Old Course
Muirfield
R Troon
Carnoustie
Hoylake
R Birkdale
R St George's
R Portrush
constitute the rota at present, with both Turnberry and Lytham currently sidelined. RStG is the most spacious open venue on the rota, once you have got there, but Deal makes terrific use of a relatively small pocket of land, with hardly any room for grandstands and the infrastructure nowadays required (and I think that would be true even if the 1st became the 18th, for these purposes).
The Amateur has some really interesting venues coming up, including Ballyliffin in 2024, but the R&A hasn't taken its other major championship to Devon since 1931, and again I don't see that changing. I personally think it very unlikely that the Open (unlike the Amateur) would ever go to a venue in the Republic of Ireland. Others may disagree!