Im not sure exactly how to frame my argument, or if I even have one, since I am attempting to explain my thoughts...but here it goes:
In your example, you say to imagine a universe which has existed for all time. If I had existed in any way, shape, form, or possibility at the moment of the singularity, I would be unable to imagine any sequence of events. Thus, the only way I can question, compare, or challenge any idea that may have existed before me is through the gift of life, awareness, and thinking...made possible by and through the reality of time.
My point is irrelevant, I know...in that I in fact am able to question, form sane (or nonsensical) observations, comparisons, and references to spheres, cones, planes, and other objects of geometric imagination made possible, again, by this thing called time.
Were there no human observers, philosophers, and thinkers even in existence..but simply a supercomputer recording every bit of data from the initial observation of time, what sort of data might we expect to find? Of course, the question of how this supercomputer was/is programmed is a moot point.
perhaps a useful question to consider is this: Would philosophy have any meaning in the absence of a human presence?