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Dear Jim,
You and I seem to agree on many controversial points.
I agree with a Multiverse that is so large (possibly infinite?) that we can't observe it all because of our speed of light scale limit, and a finite age for our Observable Universe "locality".
I agree with Supersymmetry - Fermions and Bosons are fundamentally different enough that we need SUSY to combine these concepts into a single TOE (if such exists!).
I like to play with models. If one seems to work, then I keep building on it. If one obviously fails, then I put it aside (for another application later?).
You mentioned that String theory is analog, and this certainly agrees with classical wave theory (a traveling wave on a string), but I think that these strings may also have discrete modes of vibration (like the frequencies of a piano string) that may behave quantum-like (I think that Philip Gibbs and Lawrence Crowell have been having such a discussion on Lawrence's blog site). This ties into a wierd quantum-classical behavior of strings and Philip Gibbs Qubits of Strings. In my models, the end of the string may behave like a site in a discrete lattice.
The BB and BH's seem to be two different sides (bringing forth new life vs. melting down death and decay) of the same coin (singularity). I don't think that a singularity can exist in a finite Universe, therefore the BB must be part of the Multiverse, and BH's must not be "infinite vacuum cleaners". In my blog thread, I have proposed ideas and geometries that may prevent the BH from becoming a true singularity.
You suggested that large BH's may swallow smaller BH's until - ultimately - our observable Universe consists of a single Super BH. I don't know... It is true that gravitational fields effectively stretch out towards an infinite range (falling off as inverse-distance-squared), but it would be difficult (if not impossible once spacetime has collapsed to a point?) for a large BH to move a smaller BH.
Your essay was very readable.
Good Luck and Have Fun!
Dr. Cosmic Ray