Not necessarily. One can go to positive infinity or negative infinity alone and it will still be qualified as infinity.
It is only infinite in one direction. The Creator created the Pattern, so at some point it was not - and so it is not infinite in the past.
Well.... true, but it means everyone gets forced into the Dark On'es twisted view of reality which is not a fate I'd like to see for the people I've grown to know and love over 14 books.
"Everything in Randland repeats, but it's not always exactly the same."
So mathematically, Moridin is right. At some point, the Dragon will despair, lose hope and destroy the Pattern. :/
I was kinda hoping for something a little more hopeful than that.