I don't think the lifespan of a GPU is much of a bottleneck at all. If anything, for the last couple generations, GPUs have been in a race to get as much use ou

I don't think the lifespan of a GPU is much of a bottleneck at all. If anything, for the last couple generations, GPUs have been in a race to get as much use out of them, before their generation becomes obsolete to Moore's law.