Universal Darwinism seems to be largely a superset of "constructal theory" - it explains all the same phenomena and many more besides. Where constructal theory seems associated with the maximum power principle, Universal Darwinism is more closely associated with the maximum entropy thermodynamics - which is similar, but better.
I can't be sure that constructal theory will go up against the wall - as Universal Darwinism eats its lunch. Perhaps constructal theory will succeed in carving out a niche for itself. However, it does look as though the writing is on the wall for it, written with Dennett's "universal acid".
Update 2013-11-13: I got around to reading and reviewing - Bejan's book, Design in Nature. The details are here.