Looks like a neat idea - however...... A person sat in a chair takes up more surface space than a person standing. The length of line will be probably 2-3 times as long using chairs than if everybody stood up. Disney parks just haven't got that amount of free space
These chairs could be a good replacement for ECV's. Disney can ban ECV's and require guests to use these chairs instead. The chairs have GPS and motions sensors so guests can just relax and not have to worry about braking all the time and running into people. And, hopefully people will not run into them. And, these chairs look way more comfortable, too.