I guess if you time the shot right you'll never need higher fps, in which case 5 fps would be plenty.
Just my opinion but I think most of the time the high fps is more useful in marketing the camera than in using it. My 7D2 has low speed set to 5 fps. I find 10 fps way to fast for general usage. The camera is rarely at 10 fps.
Note I said 'most of the time'. Two years ago I was shooting Arctic sterns with my T3i, claimed frame rate of 3.7 fps. They were diving in a relatively small area so I just had to point the camera at that spot and shoot in short bursts. No tracking involved. From one frame to the next a bird could go from three feet above the water in a dive, to three feet above the the water after diving in and catching a minnow. A couple of hundred frames later and I never got one were the beak was just hitting the surface. Here a higher frame rate would have been nice.