If Ford makes it to the England 10 spot sometime soon he'll surely be one of the smallest international fly-halves out there. I suppose it's mitigated by having a pretty low centre of gravity.
With respect to Farrell I feel very strongly that peoples initial acceptance of him in the International arena smacks of fans and journalists simply wanting another Johnny Wilkinson 'golden boy' type. People soon realised he was very ugly and from Wigan.
In seriousness, Farrell was passable for England as long as his kicking (tactical and goal) were accurate, and he was tackling around. He didn't have the other skills to compensate for it when his kicking went pear-shaped in South Africa, whereas many other fly halves have another element to their game. As soon as Farrells kicking and decision making went, he was found out instantly.
Saying this, I agree with Psychic Duck and feel Farrell will only improve with time, and I think many club teams would welcome him as a player.