Although you are trying to imply that Darwin is wrong about speciation by connecting what he says to an absurd reduction (of your creation) of his ideas; perhaps surprisingly to you, you have not stated a case strong enough, that is absurd enough as to be false, to make what Darwin (and other biologists) posit impossible or untrue. I could imagine some weird place (a highly controlled robot planet zoo, for instance) that could actually accommodate the absurdities you give as examples. Nothing would have to break any physical laws.
The problem though is that our real world of today and the past isn't really set up at the foundation to support the kind of situation you describe. Basically your scenario can be summed up by asking the rhetorical question, "Why don't we find a series of losers in niches, occupying places that would have otherwise gone to winners?"
What do you think happens to animals that are not really making it? Do they stay around to be observed for thousands or millions of years?
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