I think there's no question of a Japanese victory over the Brits and Dutch in this scenario. The US were locked into isolationism with a European focus, and had they not been attacked directly I can see no US involvement in the Pacific.
It is impossible to predict the effects of this from 1942 onwards, way too many butterflies around, but a UK stripped of its Eastern Dominions of Burma, Malaya, and possibly India and Ceylon could well be forced into a peace with both Germany and Japan in mid 1942.
The only factor that effect this would be US DoW in Europe, but how likely would that be, with the US looking over its shoulder in the Pacific?
Gaah!
Common, stubborn, over-simplified view. The US was isolationist... in European (and, by extension, African/Middle Eastern) affairs. It was not hands-off in Latin America or Asia, where the US had major interests. The US populace didn't want to pick a fight, but it was more than lightly involved in Japan's sphere of interest: the Philipines, the highly influential China lobby, and so on.
Riled up? Sure. Riled up enough to get congress to vote for war especially when Isolationism was a powerful force? I don't think so. Roosevelt proven time and time again that he would push the envelope however he was not prepared to go too far without congress and Congress might sympathise and increase funding for US defence or Lend Lease however have US boys killed for British colonial land? I can't see it.
Roosevelt pushed hard for a war with Germany, not Japan. The war with Japan resulted from a structural geo-political viewpoint from the Japanese side: namely, the fear the US might intervene, and the knowledge that the US could effectively cut Japan off from the Empire at any time, giving the US undo influence over Japan. The more wealth and territory the Japanese Empire has south of the Philippines, the more influence and potential threat the US represents simply by staying still. War becomes more, not less, likely.
People today forget how Racist America was about Japan and -The Yellow Peril -
Britian would send it's entire Sub Fleet to the Pacific
With American Planes, Destroyers, and Subs, tailing Japanese ships, and radioing their position. British Subs would have little problem sinking the Jap Ships.
As the Jap Merchant Marine dwindles, so would Japan's ability to wage the war.
Actually, the US was notably pro-Chinese during this period: racism tinged, yes, but the China lobby was the pro-Israel lobby of the day in terms of size, effectiveness, and public support.