Who challenges Demetrious Johnson?

I mean realistically, who is gonna give Johnson a legitimate test at Flyweight? I think most of us agree that as long as Lineker has his weight under control, the winner of Bagautinov/Lineker seems logical. But what about afterwards? Who has a legit shot? Will the division just be continuous rematches?

• Scott Jorgensen (14-8). Streak: 2L. *Next Fight- TBA*
• Joseph Benavidez (19-4). Streak: 1L. *Next Fight- TBA*
• Chris Cariaso (15-5). Streak: 1W. *Next Fight- Horiguchi*
• Brad Pickett (23-8). Streak: 1L. *Next Fight- McCall*
• Ian McCall (12-4-1). Streak: 1W. *Next Fight- Pickett*
• John Dodson (15-6). Streak: 1W. *Next Fight- TBA*
• John Lineker (23-6). Streak: 4W. *Next Fight- Bagautinov*
• Tim Elliot (10-4-1). Streak: 1L. *Next Fight- TBA*
• Darren Uyenoyama (8-5). Streak: 2L. *Next Fight- TBA*
• John Moraga (13-2). Streak: 1L. *Next Fight- Ortiz*
• Jussier Formiga (15-3). Streak: 1L. *Next Fight- TBA*
• Louis Gaudinot (6-3). Streak: 1L. *Next Fight- TBA*
• Phil Harris (22-11). Streak: 1L. *Next Fight- TBA*
• Iliarde Santos (27-9-1). Streak: 3L. *Next Fight- TBA*
• Ali Bagautinov (12-2). Streak: 10W. *Next Fight- Lineker*
• Jose Maria Tome (33-5). Streak: 2L. *Next Fight- TBA*
• Kyoji Horiguchi (12-1). Streak: 6W. *Next Fight- Cariaso*
• Zach Makovsky (17-4). Streak: 3W. *Next Fight- TBA*
• Dustin Ortiz (12-2). Streak: 4W. *Next Fight- Moraga*
• Alp Ozkilic (9-1). Streak- 4W. *Next Fight- TBA*
• Josh Sampo (11-2). Streak: 5W. *Next Fight- TBA*
• Justin Scoggins (8-0). Streak: 8W. *Next Fight- TBA*
• Ryan Benoit (7-3). Streak: 1L. *Next Fight- TBA*
• Darrell Montague (13-3). Streak: 1L. *Next Fight- Campuzano*
• Will Campuzano (13-5). Streak: 1L. *Next Fight- Montague*
• Richie Vaculik (9-2). Streak: 1L. *Next Fight- TBA*

Also take guys like Sergio Pettis into consideration. Aside from a few young guys like Horiguchi and Scoggins (example) that could be contenders in the future an guys like Bagautinov and Lineker, I can't see any competitive match-ups outside of rematches.

* Edited at 12.23.2013, 10:03 PM ET *

Johnson will have the record for most rematches given in history, not sure if there's actually a current record on this.  Right now he has two.  
Hopefully we see him rematch Pickett although I want McCall to beat him

Not a real stacked division. At this point I don't see anyone beating him. 

I can see Bagautinov or dodsoN giving him trouble. People forget how dominant mighty mouse really is not. dodson almost beat him, benavidez almost beat him and most think McCall did beat him the first time around. Pickett has a win over him and just dropped to 125 but I think Pickett is getting old and Mighty Mouse has been improving so I' don't think Pickett is too much of a threat but a Brit champ would be cool.

Anyways, just my 2 cents.

dodson probably has the best shot of giving DJ a challenge but with as fast as he is improving, I don't see anyone unseating the mouse in the next year

Bagautinov

Lineker if he can actually make weight constantly can be one of the biggest threats to the title.

If Bagautinov beats Lineker, then he'll be a big threat to the title.

Lets not forget with a win or 2 Kyoji can be fighting for the title too and I'm not sure how he'd do against Mighty Mouse, I wouldn't be surprised if he pulled off the upset.