No matter how strong you make a building, if it's built on weak foundations there is a danger that the whole structure can come crashing down.
Formula 1 is not immune to that, and its position as the battleground for the very best drivers in the world is helped by a solid base of categories below it that are feeding it future stars.
If Formula 2 and Formula 3 do not continue to deliver as a proving ground for bringing on the best young talent around, then that is as much a headache for F1 as it is for those individual categories.