We get this request very often...
It's definitely a possibility. Though we have to point out that Dual Wielding was not actually a part of the multiplayer in GoldenEye 64.
Arguably it wouldn't really add much to the gameplay, what dual wielding essentially does is allow you to fire twice as quickly which doesn't really change combat much, due to our invulnerability system.
If we were to implement it we'd want it to be done properly which would take quite a large amount of time. GoldenEye 64's dual wielding actually had a lot of depth as you could combine different weapons, for instance being able to wield a shotgun with a grenade launcher, and I think to do that justice we'd want to extend the same functionality to GE:S.
The problem then is that this feature would become very dominant, and could actually mess up our currently refined gameplay and balancing. So if we were ever to do it in multiplayer I think we'd have to probably have to limit dual wielding to single-handed weapons like the klobb, dd44, cougar magnum, zmg, etc...
In any case it is definitely on the table for consideration, but will require a lot of development time to do properly and may not actually contribute much to the gameplay, with a risk of actually detracting from it.