The KMT's situation in the postwar period would have been much stronger had Ichi-Go not happened, as it cut a swathe through the interior of the country and brought the KMT into immense disrepute, after it had gained back some prestige in stemming the initial flow of disasters. But still, even with that, they should not have lost to Mao in the postwar resumption of hostilities. They made a number of disastrous errors in the Northeast in particular, but also during the breakout period, in which it wasn't just corruption and bad troop quality that hurt them, but rather mistakes from command in allocating forces.
The US with the Europe first policy was not going to be sending ground troops for the war in China, as it would be a logistical mess and the avenues of approach required massive naval cooperation and likely an amphibious landing, which went against where US troops and naval assets were already fighting. Now, Formosa could have been invaded, and there were plans to do so, so I guess that could have counted. That likely would have happened either in lieu of or after the Phillipines were taken.
There is also the possibility that Britain asks for US help in the Burma theatre if the Japanese decide to make a push in 1943.