The US has not remotely lost the ability to launch people in the context you're suggesting (lost knowledge, lost budget, lost political will). Its literally between launch systems. No knowledge or budget has been lost. On top of it, its doing what no other nation seems able to do, spark a space race between corporations with their own goals and cost-cutting measures. That's on top of NASA's incredible record of space science missions and robotic missions in the interim.

As far as the RD-180 issue goes, ULA buys those engines and re-packages them into domestic launch vehicles that create domestic jobs and keep the majority of the profits local. There's a big difference both practically and politically between this and having a foreign company launch your satellites. So India is not being treated that differently here.

That said, RD-180 purchasing is being phased out. The Delta IV is being retired and that only leaves the Atlas V, which I believe is no longer allowed to buy new engines since an earlier sale this year. That's on top of the Pentagon approving $162m to help fund the AR1 and BE-4 engines which will ultimately replace the RD-180 for the ULA.