I might be wrong, but IMHO current mechanical keyboard revival is driven by gamer's market. Cherry MX Red and Brown are the most popular switches, while Blue would be the most comfortable for typing.
Model M and F would appeal the most to those who type a lot for living: programmers, translators etc. but there is an additional problem:
30 years ago office workers had vivid memories of typewriter's noise, dot matrix printers were common, nowadays the noise of would be unacceptable at the workplace.