Not a huge fan of Flurry Heart. However, whether she has a detrimental impact on the show remains to be seen. I'm not optimistic about the premiere, but even if my fears are confirmed and the episode is trash, it won't be a disaster as long as they limit the baby's involvement of the overall show.
The situation reminds me of Fairly Odd Parents. I don't watch it, but if I recall correctly, Cosmo and Wanda had a baby at some point that because a regular character. I'll be satisfied if that does not happen in MLP. Maybe somebody who regularly watches that show can weight in on that?
In any case, I guess we'll just have to wait and see.