Reigns was 10 times the performer that Goldberg was, sadly too many people seem to hate the guy for no good reason. He is more athletic, sells better, puts together better matches, has been part of the best match on the card several times, that's something Roidberg has never done.
The fact that Goldberg would want mega money and would end up taking away from what they'd have to bring other talent in should be enough for people to not want him. He's not a star anymore, he came back and the novelty wore off quickly. He can't put together a match with anyone and this new company will have a lot of people waiting to come on so there is no need for a desperation signing like Goldberg IMO, as I've said they should use that money on talent that'll be available from WWE very soon.