I completely understand why allied players vanish now. It's tough to get your teeth kicked in for a year before you can begin to have any fun. Fortunetly we play at such a pace (we did a game month over the weekend) that it will probably be a couple weeks before we reach 43 and then I can finally explore the fun side of this game as the allies.
Why so, where do they vanish? There are still more people looking for Japanese opponent than Allied in the Opponent Wanted section.
TBH the Japanese side IS harder to play, depending on scenario, game settings and house rules. Every single naval loss hurts Japan, and even in air, IJNAF starts with literally zero experienced fighter pilots in the pool(well, just like the Allies). Scenario 2 does help the Japanese and depending on your house rules and game settings, Japan can R&D planes and produce the good ones so much that it can stay with the Allies well into 1943, even early 1944. But not on the ground or at sea.
Remember that its still early in the game and the war will be a long one. If you're lucky your opponent will think that his victory streak will never end, and you'll get to bleed his nose HARD somewhere. Just keep your CVs alive! The Allies can, quite literally, lose every ship they have and get in 1941 and first half of 1942 and still win one hand tied behind.
I would seriously reconsider doing anything with your BBs and CVs for now. "Keep them secret. Keep them safe!" They might not achieve victories from East Coast, but you WILL make your opponent think about their location. He WILL have to prepare to meet them everywhere he is, or take the risk. The more risks he takes the easier it will be to surprise him pants down WHEN you decide to do just that. Knowing that the F6F and F4U, once you get them, WILL wipe the floor with Ki-44 and A6M could help you through the hard times.