The B-2 and the F-22 were ordered/procured at a time when the USAF still had a lot of A-10's, B-1's, B-52's, F-15A/C/E's and F-16's, so a cut in order numbers of the F-22 may not have been that difficult to sell. However, the F-15/16 are getting tired (F-15E excepted), the B-52 is positively geriatric (although it'll probably outlive all of them!) and the B-1 has been problematic since introduction. Given that the F-22 will eventually assume sole responsibility for the F-15C's job, with the F-15A now gone from the inventory, and the F-35 is meant to eventually replace the A-10/F-16 and eventually the F-15E (for a combined fleet of around 1400+ jets), I don't think a buy of a couple of hundred F-35's is going to cut it. They will have to be bought in significant numbers, whether they will reach the numbers actually wanted remains to be seen...
-RP