He is talking about what most people do, MACRO evolution or one species becoming another. That doesn't happen. Micro evolution does happen and this was just observing that (finally).
That's a weird way of thinking about it. What actually happens is that one species splits into two, when two populations of the species are separated for long enough to make them incapable of interbreeding.
Can you elaborate on what you mean by this?
You show one species becoming another, they’ll complain about how it was done. Or how long it took, etc.
For instance, ring species are pretty good evidence of speciation. But that’s not good enough because all those animals exist right now.
Actually, a version of that is good part of the (scientific) game. Of course you have to criticize the theory, the experiments etc. Only, it has to be done in good faith - to look for the truth, not to defend a position.
The difference between Newton and Bohr, and Freud and Marx (to go for classical examples), is subtle, not gross. There is an entire Science, a whole field, about that.