The increase in demand is good. It's great that more people are getting into the woods to appreciate nature and get exercise. Joffre Lakes is a great place for people to be introduced to backcountry camping and is one of the best ways for city folks to get to see a glacier.
Instead of spending a bunch of money trying to enforce reservations, I would like to see them put in some more camping spots to meet the demand. It's a little tight at the far end of the 3rd lake but there are other spots where extra camping pads could be added.