As far as I know, we have never observed anything to be infinite except as in intellectually fashioned, non-physical concepts(such as the mathematical concept of infinity), therefore I'm of the opinion that there is no point in firmly believing there is, at this current time.
Just because something is imaginable to us, does not make it a workable position in terms of understanding.
Personally I am at loss to understand the term infinity at all - To me, the moment we speak of "infinity", we're no longer speaking of physical reality, as a reality that actually has a "physical" infinity is completely paradoxical and nonsensical.
I.E, I think we can safely say that infinity is a concept that is meaningless in understanding the physical reality, and thus also meaningless to human understanding in general as we are situated in, and limited by, that very physical reality.
It might exist in some "deeper sense"(whatever that means), or it might not. But as far as science goes, and as far as human intellect goes, IMO it's just a useless term that people with limited imagination and curiosity used to label large and complex issues beyond their current understanding.
To me, using the word "infinity" is just as redundant as inserting religious ikons or explanations when faced with an unknown - It does not actually explain anything, and just ends up begging a tons of new questions that will probably just lead you away from any usefull knowledge since you're being distracted from the main issue.
This generally tends to happen if you jump to a erroneous conclusion from your initial question.
