It was never impossible for people to make an Autococker or Autococker accessories.
WGP was owned by JT Sports and they chose not to make the Autococker. Some (but not all) other companies chose not to make autococker parts because the market was reduced and they didn't see the opportunity to make any money doing so.
When KEE bought up JT Sports some of us tat KEE/Empire saw the opportunity and potential to bring back and work with some of the classic designs that were owned by JT Sports. Initially that resulted in the E-Flex and the Empire Sniper, and then the Empire Resurrection.
Now the Cocker market is growing again and some of us (I since left KEE and started my own company) are finding we can do decent business making accessories and parts for Autocockers. Some of us have even more planned in the not so distant future for this iconic platform.