As Aerosmith once said, "you got to lose to know how to win".
What this means is, you can't expect to get everything right on the first try; failure is essential to the learning process. It shows us what not to do in order to succeed and helps us to better appreciate success when it finally comes.
WWE knows this all too well. They are constantly introducing new characters into their canon, new programs for their fans to watch, and so on. They can't possibly expect to get everything right on the first try because, in a lot of cases, they don't.
Take John Cena, for example - he was one of WWE's hottest prospects in the early 2000s, but it took him a little while to find his confidence on the main roster because he didn't have a character when he first debuted; he was just a guy in tights. Of course, this is not to say that every future main eventer needs to start as a main eventer right away. Far removed - it's more to say that talents can't be expected to get themselves over if they're given so little to work with.
With that said, a rocky start isn't a death sentence by any stretch.