According to rumors, WWE isn't signing any more indy wrestlers.
Indy wrestlers are often stereotyped as vanilla midgets, but can you imagine the last 10 years of WWE without Daniel Bryan, CM Punk, Seth Rollins, Jon Moxley, AJ Styles, and Asuka? Being a wrestler shouldn't exclude you from a... wrestling company.
It's usually best to compromise. Sign the indy wrestlers who have charisma and can succeed on the main roster and keep finding gems like Roman Reigns and Bianca Belair in your homegrown talent. Instead WWE always goes to the extreme, from signing everyone to no one.