Gas clouds make stars. The formation of a galactic spiral occurs when afterward and as this paper notes, star formation in our time has degraded into the result of collisions of galaxies.
http://www.sciencedaily.com/releases/2011/09/110913195555.htm
That should indicate that we are observing an aging universe.
Is dingy gas star forming? Maybe not. It is just a guess but I think gas full of 'used gas--dust' is not able to form stars. So the answer to the question of why stars are no longer forming is that stars have been formed.
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