Ha, of course with that long time scale there would also be a possibility of a revolution and that particular family getting their head chopped off in 18th century...
But anyway, current would-be-king of Finland (we were a kingdom for approximately three days back in 1918) lives nowadays as fashion photographer in New York.
And if Russia would want to swicth back to having a czar of Romanov family, the current heir lives in Florida (or lived couple of years ago).
I am formally announcing my willingness to take up these onerous duties if it is discovered that I am in line behind the forklift guy...you know, just cuz he said no...so they have a back up.