Who will replace Steve Nash four years from now, when he finally looses his dominance at Point Guard ?

I was thinking of the Possibility of someone replacing Steve Nash in 4
years. . I know Steve Nash is a 2 time MVP  but the Canadian is getting
a bit old. Eventhough he shows no signs of aging and for some odd
reason gets better with age, but  what will happen four years from now
when Amare is in his Prime, When Shawn Marion is playing at his peak
aswell , what will Steve Nash be doing? Im sure his current  role will
only last maybe 2 years Max. Then Father time will knock down his door
..



So my question was this? Who fits in the most with the Suns in four
years from now? Id say maybe CHris Paul would be an excellent addition
to the Fire Offense Suns.