Sorry, but your question makes no sense. You seem to be working under an assumption that races have some meaning beyond what people try to give to them.
To to demonstrate what I mean, what you describe as “current phenotypes” are only one of several current ‘European’ classification phenotypes. Only Europeans and their cultural descendants classify people in that manner. If you ask a Malaysian “Mongoloid” and he will tell you that he is most definitely not the same race as a Chinese, and that he is the same race as a Malaysian Australoid. Yet according to the scheme you describe the two Malays are different races and the Malay and the Chinese are the same race.
In other words what you consider to be a race only exists inside your head. Other people group races by different criteria that are neither more nor less valid than your own. So with that in mind let’s look at the questions you are asking.
If you are asking if prehistoric skeletons throw up people that don’t fit into the current European classification system you list then the answer is, sure. What you need to realise though is that there are hundreds of millions of living people that don’t fit into the current European classification system. For example almost the entire population of Ethiopia doesn’t fit into the classification system you describe. They aren’t Negro, yet they aren’t Caucasian or Mongoloid either. So what are they? And just as modern Ethiopians don’t fit neatly into the classification scheme you describe neither do a lot of prehistoric people.
If you are asking whether the scheme fits modern people better prehistoric people, I really don’t know. Since we know the scheme was made up from looking at living people it should fit modern people better. But the fact is that it doesn’t fit modern people very well so the fact that it fits prehistoric people even less well wouldn’t be very surprising.
Neither. Races can’t become extinct because races only exist inside the human mind. They have no objective reality. They are entirely social constructs. A race can no evolve, assimilate or become extinct than any other social construct.
Do you see how the question is meaningless? You might just as well ask whether Prussians are extinct, just evolved or assimilated. The question has no biological meaning because ‘Prussian’ has no biological meaning. Prussians are no longer with us because we no longer categorise people using the same arbitrary boundaries. That doesn’t mean the actual people are extinct, or that you can’t find large clusters of people today who are physically and genetically identical to the Prussians. All it means is that we redrew the boundaries inside our heads and the Prussians are now considered Austrian or Polish or whatever.
In exactly the same way asking whether a race has evolved or become extinct or evolve is meaningless. And for exactly the same reasons. If a race is no longer recognised it isn’t because anything has changed biologically. It is simply because we have changed the boundaries inside our head. Large groups of people with exactly the same physical and genetic characterics still exists.
Yes, but only in the same way that new nations evolve and old nations die away. It isn’t a biological process, it is purely social convention.
Like a mixture of, or subsection of, any race or races that exist in any current classification scheme.
Like a mixture of, or subsection of, any race or races that exist in any current classification scheme.