We can only hope they release a new game, though I doubt it will happen. Make it a bit easier to gift swimsuits, and make the mood system a bit easier to read. Have a heart meter, and when it is full, the girl will accept a suit no matter what.
I think the problem with DoAX is it lacks of good gameplay mechanics. Theres a lot of potential in the franchise, but it needs: better gameplay (the volleyball is 'ok', can be much better), and some more minigames. A history for each character could be very cool too (Im not saying about a 'excuse', a true history). Its hard? Indeed. Its impossible? No. The X2 was awesome in some ways, but it has its glitches, and to get some of the content you should play for too much time, what was frustrating at least.