I personally don’t think you need 120fps to prevent missing that one moment, sports togs have been coping for years getting that moment with much less frame rate, they even used to manage it with film cameras at 1fps. It’s about knowing the sport, predicting when and where the shot will come. Sure with 120fps you could get lucky, but if you know what you’re doing you can get the shot without it.
When I’ve shot with or spoken to pro sports togs the fewer shots they can take the better. Many say they shoot in 3-5 shot bursts. TBH I’ve had a number of wildlife togs say the same.
Obviously everyone’s experiences will be different but I’d hate to shoot at 120fps. I’ve got carried away at some events coming back with over 4000 photos and it’s a royal pita going through them all. At 120fps that’s less than 40s of shooting
Since when did the D70 have a global shutter?