For diversions? Yes... As an ATCO it probably makes your job so much easier.
Ah! now do you think it makes the crews, you know the pilut chappies, and airline operations, and the airport and handling agencies etc etc, lives any easier knowing that they can make CatIII or CatI approaches on the runway?
Do you honestly think CatIII will bring in airlines?
I think its unlikely to turn them away. What do you think?
Is a new customer likely to prefer an airfield in controlled airspace, with Cat III/CatI ILS and 365/24/7 ops, nearer to significant transport infrastructure and potential markets, to one that doesn't a few miles further away?
In your own time ...