They have offered a spot for Bob but he doesn't want it (yet). Reason being is Bob thinks he has "one more run" and thinks the Hall Of Fame would only be appropriate if he was done for good. So he'll be in one day, it's up to him when. This was confirmed on one of the Legends Roundtables on 24/7.
I remember back in the day (RSPW) when Hogan was facing Vader and there was a lot of hope/talk that Vader would shoot on Hogan when he faced him in a title match, IIRC. Why aren't people asking for Brock to shoot on the Undertaker?