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Why would not all microevolutionary changes necessarily lead to macroevolutionary consequences, given enough time? What's to stop the process of change?
Nothing would stop the change, as such thing never occurs. Current theories of evolution with many mainstream evolutionists are pseudo-scientific claims. Gradual reproductive isolation by geographic isolation, sexual or natural selection are just fairy-tales without any prediction value. Nobody can tell which organism by which mechanism, by how long to become what kind of organism.
Hilter, Stalin, MAO had all kinds of "scientific evidences" to support their theries, but they can not provide any cases to falsify them. People seem not learning lessons from history.