Fact is, Skippy there may already be as equal to other animals in terms of the ability to survive, so he needs no evolution to help him with that. Though he can get caught on land, and make the same deadly mistakes any animal can, he has the ability to hide on both land and water, as well as to move to places the fish cannot, in search of food, or another puddle in case of drought, when his puddle dries out.
Not to mention he can spit water in his predators face, and while they're doing the whole "Ewww!" thing, he's outta' there.
On a side note, one might think the same of a lung fish by the way they look and the fact they may seem pretty helpless, and in need of the help of evolution, when they are far from it. They can live 5yrs underground without food or water, where they can out live many other type animals in certain types of disasters, including some of their own predators.
Animals survive or not because of how they were made, and not because they made themselves survivable via evolution.