No doubt it will help but there is no substitute for more people to search and evaluate border crossers. And since any fence has its week points someone will have to patrol it.
If the fence is finished Columbia, et al. will start pole vaulting classes for smugglers.
The Security Fence Act did call for more border agents.
Congressman Duncan Hunter, author of the act, advocated any that could poll vault the fence to be signed up for the Olympics :)