I think this is a great idea. Elephant Bar didn't do well for many reasons and the vacant lot hasn't been a big draw for any other restaurant so why not add an In-N-Out.
Lots of people are mentioning there are other burger joints in Campbell but they neglect the fact that these establishments are not drive through and many are more of a sit down style restaurant. In-N-Out offers something those don't.
The other main argument people are making is how at every In-N-Out the drive through line snaked through the parking lots or onto the streets. This location has a fantastic proposal of 60 parking spots and a drive through that can handle 22 cars without taking any parking lot or street space. I would encourage people to view the full plans to see the structure is getting smaller, they are planting more trees and landscape, and they are keeping the entrance to the drive through only accessible from Hamilton to try and help reduce the impact on the neighborhood.
It seems like this will be a great growth and revenue opportunity for the city. Plus, if the city wants the congestion at this intersection to change significantly they should complete a study so the lights are timed better, allowing for better traffic flow. Until that happens it doesn't matter what restaurant/retail shop goes in, the traffic isn't going to improve. Traffic in the the South Bay is getting worse because more houses are going up. Sorry but In-N-Out isn't going to impact it that significantly.