" ... remind us that time is something coming at us through events and interactions, which make it emergent or interactive."
I can't agree, Jonathan, though I appreciate your view of John's view. Thing is, I don't have a view of time -- I can only understand in a formal way that if it is an emergent phenomenon, the consequence is quantized space that is independent of time, which implies that space is independent of time.
"I think perhaps Minkowski understood the marriage of space and time as spacetime better than did Einstein, and that we are stuck with a less fulfilling consensus than might have resulted without some of the filtering that has taken place as a result."
I think it's fair to say that Minkowski had a better mathematical grasp of spacetime and Einstein had a better physical grasp.
"However; even while I feel it is likely that time existed before space-like dimensions emerged in the early universe, I think Tom is 100% correct that space and time are virtually inseparable in the current cosmic era, and survive only as a union of the two in spacetime."
I see no reason that time should ever have existed independent of space; in fact, I see a unit of time identical to a unit of information, a quantum bit. I can't see a further reduction of the pair without losing the measurement function entirely, with the result being that physics is done by analogy and metaphor. Even Lev Goldfarb, who has one of the most radical ideas of computability that one can imagine, nevertheless retains the formal structure of time. (He and I agree that time is identical to information.)
"However; I still see as viable and important the views of George F.R. Ellis and colleagues that an event as extreme as a black hole event horizon formation might split the two again, so that the astronomical object has an outer space-like apparent horizon, with an inner time like one."
Well -- it will be another "black hole challenge" then. Is the universe closed off from observation in the special case -- or does the case of uniformity apply generally? My bet is on all physics being local, without exception, in a topologically simply connected spacetime.
"But it can be said that such a splitting could only take place near an initial or final singularity (or near to where there would be one), and not in 'normal' space."
If all physics is local, all space is normal. (Both in the colloquial and the mathematical sense.)