If this is the case, it scares me to ride Vekoma equipment.
Reference: Screamscape.com and Straits Times
Even New York has no major theme park, why should Singapore be able to sustain one?
Couple a day at USS with an evening at the zoo's Night Safari and you've got one world-class tourism day.
That said, it is undeniable that the main draw for Resorts World Sentosa is the casino, and the USS plays a supporting role. However, when USS gets all its attractions open, I think that the park could step up to a leading one.
From what I saw when I was there, it appears that Singapore is drawing many tourists from Australia and New Zealand, as well as the US, UK and Japan. There's great potential there - the island simply needs a few more attractions to reach a critical mass where it becomes a top, high-demand, week-long destination itself. (Though I easily could find a week's worth of things to do there now.)
I dont think we can compare Singapore with the US or any of its cities. Totally different.