Well, one of those proposals was for a stationary platform. Granted, it was a quarter of a billion dollars more than the semi-free-floating one, but in either case, glideslope wackiness would probably not be part of the equation -- how many airliners make six-hour final approaches? -- and tailhooks certainly would not. Remember, the platform only moves with the tide (or perhaps a tsunami, in which case approaching planes would probably be diverting far, far away.)
I have no idea if this plan is feasible, but it would not seem to be unfeasible for the reasons you mentioned.
New airplanes, new employees, low fares, all touchy-feely ... all of them are losers. -Gordon Bethune