Chuck77 writes:
There were limited predators after the flood.
Yes, and what do you think they'd go for? Fast and agile prey, or prey so slow they could literally pace to them, study it for fifteen minutes, and then decide to end it's misery because after all they gotta eat something.
There were limited marsupials also.
Uhm... Yes, yes there were.
It's a good possibility they could have survived.
A "good" possibility? Why? Why is it a "good" possibility?
Plus all the fish that were on land after the flood could have kept them (the carnivores) busy enough for the sloths to safley make the journey.
Not all carnivores eat fish. Those that didn't had a choice of fast prey like deer, or prey so slow it would take them a year to move even a mile (note: this is hyperbole).