I think that in the end it's easy to guess what Vegapunk's dream and ultimate goal is and what the SSG are, based on his failed dragon devil fruit, his knowledge of the key for life that Judge also used for his own purposes, the Germa children's abilities experiment, the Smiles created by Caesar Clown based on Vegapunk's work and the Pacifistas having Kizaru's laser with X-Drake noting that Vegapunk managed to put it on them.
Vegapunk's goal is evidently of creating his own devil fruits with him cloning of the original devil fruits and their powers entirely, and possibly of creating new devil fruits' abilities.
[automerge]1645617603[/automerge]
WG could have killed Luffy since his first bounty or at least since he invaded Enies Lobby Impel Down or Marineford.
They wanting Luffy dead now because his potential DF awakening is the shittiest writting ever.
Well they were never very competent antagonists to begin with.