The problem with all such airport rail links is where to put them or where you can put them. For example, I do not see the BKK link as being any worse than HEX going into Paddington which is virtually useless unless you have business or lodgings in that area. Some will always be better than others; CPH and HKG spring to mind. However, in BKK as elsewhere it is still a useful addition and it will have a market, mostly for those for whom every penny counts, those who feel uncomfortable using taxis, and those who are lucky enough to find that is goes where they want it to go. In the comming year I think we may start to see quite a lot of development in the areas adjacent to the rail-link stations.