Question: We witness the closure of the tesseract once Coop successfully sends the singularity data back to Murph. And then it appears that Coop is sent back through the wormhole to our home galaxy.

Is the implication that the wormhole remained open, and only the tesseract was closed?

If so, then I imagine as soon as Coop rendezvouses with Brand, the rest of humanity will follow (at least the ones who don't prefer living on a giant cylindrical habitat)? At any rate, it doesn't seem likely that Dr. Brand would be alone for very long, which takes some of the urgency away from Coop's final voyage.

Answer: 
No. The wormhole is closed according to Christopher Nolan, the director:

<http://www.ign.com/articles/2014/11/08/jonathan-nolan-interstellar-spoilers>

> 
> Nolan: ... By the end of Cooper's journey, the wormhole is gone. It's up to us now to undertake the massive journey of spreading out across the face of our galaxy. Brand is still somewhere out there on the far side of the wormhole. The wormhole has disappeared entirely. It's gone.
> 
> 
> IGN: And he has to try and get to Brand in this little ship?
> 
> 
> Nolan: That's the idea.
> 
> 
> 

This, however is confusing, even though the director said it himself. The movie implies that the worm hole is open and that Cooper is going to travel back through the worm hole and reunite with Brand.

If the worm hole was gone, then how would Cooper ever possibly find Brand? She is in a completely different galaxy that would take thousands? millions? of years to reach by ship without the worm hole. If that is the case, then where is Cooper going in that little 1-man ship? What is the intent? It doesn't really make sense in the context of what you see at the end of the film. The movie certainly implies that Cooper and TARS steal the ship to fly back through the wormhole and reunite with Brand. This is the only interview I've seen where Nolan has explicitly stated this.
The film's [official novelisation](http://www.goodreads.com/book/show/21488063-interstellar) would suggest that the wormhole is still in place and remains active. 

Although at this point in the story Coop isn't really up to scratch with current affairs, it's pretty likely that by this point someone would have, oh, mentioned to him that the wormhole was gone:

> 
> *"Maybe they had already sent somebody to help her. Any of the Rangers
>  was capable of making the trip, **what with the wormhole still sitting
>  right where it had been.** He resolved to bring it up next time he saw
>  the administrator. Wolf or no Wolf, Brand would need help."*
> 
> 
> 

This heavily conflicts with what the [Film's Director has said on the subject](https://scifi.stackexchange.com/a/104246/20774) but in this instance I think we can make our own judgments on whether he was mistaken, mischievous or malign in his response.