Linear motors have been around for a long time and not just for experimental usage. They're are dozens of suppliers. Factory automation/roboticis, my area, has many applications where linear electric motors are a perfect solution. I've never used one to launch a plane though. There are some good features and some very bad features about linear electric motors. The worst, system cost, is why they're not used more than they are for linear motion in industrial automation. There are less expensive and simpler devices to achieve the same thing. But when you have the right application and budget, they do a nice job. I'm confused on why the Navy is using Disney as Disney's name never came up when I needed experts on linear electric actuation.