This assumes, however, that we've had a clear and consistent definition of the term species for over one hundered fifty years, which certainly isn't the case.
Biologists can't even agree now what definitively constitutes species.
How can evolution predict what will make sense as a transitional form, if it can't even postulate what makes sense as a species.
Biology doesn't have a clear definition of species because there is no clear fact of species. If you look at ring species you see what the term means, it is simply a human label applied to a population that does not usually interbreed with similar populations.
Ring species are a living laboratory demonstrating how populations transition into strong varieties with no absolute boundaries.