With the Germans in particular hungry to mine every single niche – fanned by the flames of electrification and a hunger by the ever-growing number of global billionaires for the biggest and best – an 'uber, uber SUV' above the X7 will probably happen. BMW is saying nothing of course, and we're only speculating here, but if it ever happens, it would almost certainly be electric or electrified, and may spawn a Rolls-Royce offshoot, since BMW owns that English brand. So, nothing for now, but don't bet against an X8 or even X9. They're likely inevitable given enough time.