Any chance of anyone else doing the triple these days? Not likely. Not only is it just too hard with so many talented drivers, the number of race categories has exploded and there will always be a calendar clash. An example was Fernando Alonso last year having to skip an F1 race to qualify for the Indy 500.
Alonso is probably the only guy left who could possible manage a triple crown as he's already won an F1 world championship and showed great speed at Indy before his Honda engine let go. He could still do it in a few years' time and then it would be on to Le Mans. At 36 he's got plenty of time to get around to racing and winning at Le Mans.
Other than the Spaniard, I can't see anyone with either the broad talent, or the desire to take on such a task. Can you image Lewis Hamilton, or someone like him, first of all being given the time off to have a punt in some other sort of race car, and second, I doubt he'd want to do it. Might infringe on his red carpet time.
Back in the day the race cars were pretty much all the same. Four wheels, an engine, a bit of suspension, a seat, a steering wheel and sort of brakes. Now, you have to have a degree in electrical engineering just to work out which button to push on the steering rectangle.
Today's race cars are too specialized and far too different across the categories. Sure, there would be the odd driver who'd stick their hand up to have a go, but teams, manufacturers, sponsors etc, would be too big of a road block.
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