well, there was no way to sustain more than a few companies, since the end of the cold war. plus although lockheed is the head designer, they still part out the work to other companies like boeing. the thing about the f-111 and the f-35 is the f-111 is huge and has a long range, and is essentially a bomber, which australia needs. the f-35 is a small fighter, they want to replace the f-111 with a f-35 strictly because no f-111 type aircraft exists. i wonder if they have the budget to possibly have some us companies design a plane for their needs. maybe the us would be willing to part with the b-1 when the military finally scraps it, kinda like when the us gave the old f-111 stuff to australia.
even though they say the design is for all services, it's essentially just like the f-18 which was originally designed for the f-15s role then later modified for the navy, so i think they're going to do the same thing with the f-35, fulfill all requirements by minimal airframe changes to fit the needs of the navy and marines; so really it's 3 different planes with interchangeable parts.
i agree we shouldn't put all our eggs in one basket, we should hold prototype (x-craft) and design competitions every decade to advance our technical expertise. but that is expensive, and we really have no competition. plus the next wave of uavs are just around the corner, so that'll fill the need for a loitering bomber. i wonder what classified planes are in the works. hopefully one with insect like agility.