My knowledge in this area is somewhat lacking, but here goes anyway:
The last article I read on the subject said that the universe was expanding at an accelerating rate. So, where as here on earth what goes up slowly approaches a speed of zero then comes back down, and what we know in space will jsut go up at a constant speed unless some kind of gravitational force affects it. The universe, on the other hand, is doing neither.
Now, I have no idea why it's doing this, but this phenomena does tell me a couple things:
1) we're not sure how this phenomena began
2) we barely know what's happening now.
That said, I made the following conclusion:
To discern a pattern, you need to pinpoint a minimum of 2 points in a series (1 and 2), and even then, it's not likely to be an accurate pattern you've figured out. Since we have no clear census on 1 or 2, we have no idea what 3 is. Ergo, it's a bit early to weigh in on the universe fizzling out without even a wimper theory.