I think, if this discussion was based right after Shukaku was removed, then yes, Gaara would be weaker overall.
But now, he's seen how much the people of Suna cared for him, after the Akatsuki arc, he sees that he has a responsibility as Kazekage to protect those around him, those of his village.
The same way they're prepared to put their lives on the line for him, he's realised he has to return the favour.
In that time, he'll have been training his ass off to be the best he can be. He isn't to be underestimated as a simple pushover. He's grown and matured throughout the Naruto anime as much as any of the other characters. Don't be surprised to see some new skills on his behalf, should things at the summit turn violent.