I live about 40 miles from the locks on the Southern Edge of Lake Michigan. I work for the national park here and I have been doing a program on exotic species for a while and one of the things that I have found is that the Illionis River is not the only way for the Silver and Bighead Carp to get into the lake. A professor in Wisconsin did a study and found 26 possiable routs for them to get into Lake Michigan. So even if they close the locks the darn things are still going to find a way in.
It is going to be a bad thing when they get in that is for sure but I do not think it is going to be as bad as they are making it sound. For one thing the carp need river type current for them to spawn! There eggs can not lay on the bottom they have to keep moving. If they lay on the bottom and get covered with anything the eggs will not hatch. Also there are fish like the goby, another exotic, that will just love eating there eggs. Second they will want to stay around the warmer water like the shad. So once you are a mile or two off shore there should not be many carp out there. Now given you will have to keep you head down on the way out but once you get out you should be good. Also when these fish are jumping it is at higher sppeds, trolling speed they will just swim away from.
In My Opinion we need to start looking at what do we do when they get in the lakes! Commercial netting for them, remember they are the #1 farm raised fish in the world. Major stocking program of native predatory fish, the northern pike would be a good one! I am sure there are other things that can be done but it is NOT going to be the end of our salmon and trout fishing. Maybe they will majorly increase in Salmon and Trout stocking to help control them!