Your theory of a continuously expanding universe presupposes that the universe is not a complex topological form. However if it is like a four dimensional klein bottle, then your theory will not be accurate because the matter in the outward expanding wave will flow back in upon itself due to the curvature of the space time it travels in. You also presuppose that there is no force which will cause an attraction to draw everything back again. Just because no one has measured it does not mean it is not there. Lack of evidence is not proof. However your comments were interesting and showed that you at least thouht about the subject.