In reply to Pete Pozman:
You can still come in/out via Srinagar if you want to, but there can be minor security issues sometimes on the Srinagar end. Many people fly in now from Delhi, but some do the two-day jeep/bus drive from Manali, via the Rohtang La etc.
They're building a tunnel under the Rohtang La, and pushing roads into Zanskar at quite a rate, so when that happens the Indian motorists already flocking to Manali and Leh will proliferate. While there are good and bad aspects to such development, it certainly spoils many of the classic trekking routes.
If they are even thinking about going there, they should go now.