I suppose that every time there is difficulty. I remember about Space Mountain: It took us ten years before we found the technology that would allow such a ride. And during these ten years I had a model that I kept waiting for the technology we needed.
I think 'Family Guy' and 'American Dad' have definitely staked out their own style and territory and now the accusations are coming that 'The Simpsons' is taking jokes from 'Family Guy.' And I can tell you that ain't the case.