Undermining long-held paradigms

The theory of gravity is a paradigm as defined earlier.If I don't know exactly where a base ball will land when homered it has no effect on the paradigm involved. If it never lands I have a problem with the paradigm and need to consider if there are additional things that need to be considered -- in this case that might be the relative density of air and the ball.Evolutionary models tell us that mammals today had ancestors at the time of the dinosaurs. What size they were does not enter into the paradigm. It simply has no effect on evolutionary theory.If we had NO trace of possible mammalian ancestors from times before the Cenozoic that would be an area of somewhat focussed research since it would be hard (impossible) to explain with the current paradigm. But even then there are other things that might be considered -- though I'm hard pressed to think of any(a hint of a paradigm changing fact).