So has Evolution.
Nope. See here.
Reading closely, you will see that "the literature contains many instances where a speciation event has been inferred". In fact, only by redefining "speciation" from "those critters that cannot interbreed" to "those critters that don't choose to interbreed, most of the time" have any experiments "proved" anything. In other words, the original definition of speciation was changed because the experimental evidence did not fit the desired result. As it now stands, all the different dog breeds can be considered separate species. Joy oh joy. When the results don't get you were you want to go, redefine the constraints.
Excluding plants (which are pretty easy to evolve), the experiments with animals have been pretty much restricted to flies. Almost all the experiments "infer" that eventually speciation (in terms of the original definition) would occur, but getting flies to the point where two subpopulations mainly choose not to mate is considered conclusive evidence by most biologists. The TOE balances upon experimental evidence such as this. One of the most telling statements is: "The fact of the matter is that the time, effort and money needed to delimit species using the BSC is, to say the least, prohibitive. "