The contention by the scientist that he brought up is a good one. There's way too much speculation in some of the things that guy said. Where's the evidence to back up the claim that predators were the cause ofthis creatures apparently moving to land. Pretty high level of reasoning ability demonstrated by that creature there. It's as bad as the comment I heard on a show about cheetahs that explained that the cheetahs left their previous region to avoid an outbreak of anthrax. Sheesh. Where do these people come up with this stuff?
There have been whole books written on the coevolution of predators and prey.
I wouldn't say predators were the cause, but land was definitely a wide-open environment at this time--no predators, plenty of food. The evolution of fish that spent more and more time on land and eventually moved there is to be expected. Not because they just "decided" to move there but because the ones that happened to start the move succeeded so well.