This has to be one of the longest droughts in American tennis on the international scene, Roddick's 2003 USO victory is the last American Major victory. 17 years ! All my life an American(s) were a constant on the top 10 even top 5. Pre-Roddick we had all at the same time Sampras, Agassi, Courier & Chang, hell in that time the 5th American Todd Martin made 2 Major finals, and like 4 SF's and a boatload of qtrs, before that Johnny Mac, Connors, Geraultatis, and before them Stan Smith, Arthur Ashe, Clark Grabener all in the Open era.
Per what Fiero said earlier, I think today our American cultural "mentality" may work against us, as others around the world can be just as good on HC, which used to be American "turf"...
Possible solutions?
I would looove to see some American parents take a gamble; decide that their promising youngster could say, do well in training at the RAfa Academy (or some other European site such as Patricks M) for a couple of years to see them becoming more well rounded. The tougher competition seems to be centered in Europe these days. At the risk of generalizing, I also notice that clay dirtballers have a tendency to adjust better to HC than the other way around.
(Sidenote: more than a few ATP foreign professionals cut their teeth playing NCAA tennis their college years here in the State, so for them the US isn't so strange.)
One of the things I hear constantly from American players is how "homesick" they get playing in other venues, especially Europe. Listen, being on the road has to be tough, (especially for South Africans, South Americans and Asian players who travel almost exclusively abroad) so I'm guessing that anything that makes you more adaptable early on could be potentially good.
Cost wise, would it be any more prohibitive than some of the other pricey tennis academies here in the States?
Plus the parents can visit them abroad !