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The speed of light is also different through different substances. Seeing as how we know very little about what is at the 'edges' / far reaches of the universe, we can't tell for sure what the speed of light there is, or what material alters it. Black holes are also fabled to be able to bend the path of photons, which seems to me like it would modify their speed (not just velocity vector).
I don't think it's necessary to consider the universe when considering infinity. Instead of taking the object of question and casting it in the light of things we know, what we, in this thread, are doing is casting it in the light of things we actually know very little about.
The concept of infinity is older than our knowledge of the universe, so surely we don't absolutely need modern science to answer the question, do we?
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In the end we are but wisps
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