wrote:

[...]
Parenthetically, the revised Schwarschild radius for the proton is
about 0.8 x 10^-13 cm, which is about equal to the charge radius of the
proton and the revised Planck length.

In that case, the model is pretty much dead. High energy experiments
probe the substructure of the proton down to about three orders of
magnitude smaller than that, and there is absolutely no indication of
anything remotely resembling a horizon.

(The 1990 Nobel Prize in Physics was awarded for the first experiments
in this area. For more recent results, look up, for example, experiments
at HERA, which has a resolution on the order of 10^{-16} cm.)

Steve Carlip