I suppose that the root of the speculations of that kind is in the restrictively physicalist treatment of matter, energy, space and time, evolution and development, life and reason. Of course, a scientist may play with theoretical models, and apply any concept to anything. However, if the conclusions derived from a particular application prove to be absurd, one should adjust the model, rather than proclaim this absurd as a final truth. Most people are aware of the fact that physics is not well suited for studying psychics, life, or even chemical processes --- and the very existence of different sciences indicates some difference in their subjects. Therefore, a scenario of cosmic evolution based on one or another physical conception may only be an illustration of the formalism, and such an unlimited extrapolation would only be useful to stress the limits of the theory's applicability.
Many bright scientists become fascinated by their professional work to the extent when they cannot distinguish the models of reality they build from reality itself. This disease is especially characteristic of pure theoreticians, like gravitationists or quantum-field scientists. Well, mathematical tricks may be most exciting --- but they will ever remain just formal manipulations which have to be filled with meaning from somewhere else. Mathematicians like talking about "rigor" and "proof" some philosophers believed them and spoke of "verification" or "falsification". However, nothing can be ultimately "proved", since any proof is based on some a priori assumed statements, and follows some logical tradition; the both premises may be argued, and subject to historical development. If something is properly "deduced", it is not necessarily true; this circumstance has now been partially reflected in the mathematics of computability.
So, the role of extrapolations like Tipler's (or Dyson's) is to indicate the limits of contemporary theory, and to express the necessity of a new conceptual basis. I could formulate several problems that might objectively inspire Tipler (conscious or not).
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