I just cannot understand this thinking. We all know SWL will bring massive crowds, why not have as many new experiences you can to spread out crowds? My family and I did the Mermaid show back in Dec and it was a huge embarrassment for Disney- just no where up to par for their standards- I had not seen it in years and we thought our daughter would enjoy it....Come on Disney, update these shows!
While I agree that Mermaid and BatB (along with the open area theater) should have been replaced long ago... nothing is going to appreciably spread the crowds within DHS. There will be a 2-3 hour queue to get into SWL and they'll be closing the park and the parking lot by 10 AM.
New shows in those theaters won't ease that kind of pain.
Now, new stuff in the other 3 parks for when people can't get into DHS... that will be a help.
We'll get a preview of what "a good number of rides" can do when SWL first opens in DL. I'm thinking... not much.