You would think more Americans would fly to India to get expensive medical procedures done. Or are there other issues that need to be overcome to do this?
1. People don't know about it.
2. Are the outcomes comparable?
3. Legal protection - you will have hard time suing Indian specialist in India and there won't be much damages to extract anyway.
4. Age? A good chunk of people that need that types of surgeries are well covered by Medicare.
5. You also need plane tickets, recovery time and at least one companion - so you may look at a lot higher total cost.
6. Plain old fear/ racism.
And the moment it becomes common there will be the full media smear campaign, scaremongering etc
However, ironically enough, the USA has a booming medical tourism industry also. At about 60-80k, it is only half as small as India (150,000), though nowhere near Thailand (1.42 million).
"Need a heart bypass? We'll give you $10k and waive the co-pay if you do it in India"