My god what a stupid idea .... I mean as people have already noted here (and in the comments section of the article) tons of people are just going to hop the line, hell I would probably just hop the line.
There is going to be a choke point regardless of where you put the scanner, and as long as you have the same number of scanners, it doesn't matter -where- you put them, at the start of the line or at the merge, or towards/at the end. They should just put the scanner at the end, as long as there is a space to fill up after the scan of people to load the ride.
Hrm ... is this yet a second look at the downfall of FP+ ? Lets see, CM's cut, then Kiosks removed, then Wishes FP gone, now scanners being deactivated .... doesn't seem like FP+ is working out the way the bean counters thought.
Now, the FP+ by the app is a nice change, I am going to enjoy that, might even make me like FP+ more than I dislike it on balance, will have to see how it plays out re availability or will this just put even more pressure on the SB lines.