Tom,
I think one might distinguish between testifying as to process
and making assertions as to the significance of a digital
signature. I was trying to separate opinion from fact. I think
a PCA would presumably be willing to testify (and could be
subpoenaed in any event) as to the process by which certificates
were issued. Just what value to place on a digitally-signed
object, however, will evolve with use and possibly as legal cases
and legislation unfold. I'd be interested to know if my opinion
still differs significantly from yours.
vint