This time next week, Fernando Alonso will no longer be a Formula One driver. For many in the sport there is a great deal of frustration in that fact, fuelled by an overwhelming sense of 'what if?'
What if Alonso found his way back into a competitive car? Would he then be fighting Lewis Hamilton for the title at the final round of the season this weekend? And would that mean he'd be staying in the sport for at least two or three more seasons?
Ultimately, how much unrealised potential will be leaving Formula One on Sunday night?