Just wondered, what routes are at their capacity, and are likely to be increased?

Routes like UK-UAE. How are the Bilaterals on that? Are they unlimited or at their capacity? I know that BA and EK and others would like more routes.

I also know recently UK-Austrailia went unlimited , aswell as London-Moscow, as part of deals with the govt. of each country.

So does anybody know of any bilaterals that are restricting airlines starting/increasingg frequency of profitable routes? Or have been lengthened?

Any comments are apprechiated.