Robinson will probably be a more effective player than Landry going forward, especially under Karl, but that has more to do with how awful Carl is playing, than Robinson becoming an effective NBA player. JT is an excellent post defender, who also has versatility to play two positions, and with DMC having a strong preference for left post this comes in handy http://on.nba.com/1vLxUYM.That's exactly what I'm saying. Robinson, given comparable minutes, will be better than both Thompson and Landry next year. He was already this season. If we want to make the playoffs next year, we need to stop playing subpar veterans simply because they're on the payroll. Thompson hasn't produced reliably for going on 7 years now. It's never going to happen. Landry is valuable only as a scorer and he's not really even doing that anymore. We can probably replace his 5 shots per game and mediocre defense/rebounding/passing from the D league at this point. Just buy him out -- sunk cost. Robinson isn't the defensive PF we need in the starting lineup, but he'd be on upgrade on the bench right away. I also think he'll have a better career than all of the guys you listed (minus Horry's improbable 7 championship rings).
So no, I don't want us to sign Robinson because I'm happy with losing. I want us to sign Robinson because we can make the playoffs next year with league average production at PF and nobody we have right now is getting it done. Like I said, I know it's a lonely bandwagon.