Yep. It's been ~18 months since we first heard of Edward Snowden, and there have been no significant policy (as in, presidential executive order) or legal changes to NSA surveillance authority.
I don't know why there's no modern-day Church committee, but here are a few hypotheses:
1. Sen. Church was running the investigation circa 1975, a few years after Watergate was exposed and a year after Nixon resigned. I suspect there was much more public concern about executive abuses than there are today, and the GOP's willingness to defend the Nixon administration was limited post-Waterage (compare to now, where nearly all Dem politicos will defend to the hilt a D in the White House).
2. Much of FedGov's surveillance abuses pre-Church were clearly illegal and criminal. The lesson intelligence agencies learned is that, no matter how dodgy the behavior, as long as there's an AG opinion theoretically blessing it, you won't be prosecuted. So the surveillance abuses today may violate the 4A and our sense of proportionality, but they aren't clearly indictable offenses. Instead of "clearly illegal" you have "AG blessed in a written opinion and lawyers may disagree."
3. There was no Intelligence Committee back then, so TLAs were more limited in being able to get congressional buy-in for warrantless surveillance. Now there is, and Feinstein (and Rs on it as well, to be sure) have been the biggest defenders of the NSA post-Snowden. They have to be: they were read in on the programs and were complicit in any wrongdoing. Answer: argue there was none!
4. Forty years after the Church Committee, people now may expect to be under surveillance (sadly) and expect FedGov to be corrupt. Look at post-1970s movies like Enemy of the State, Gattaca, Minority Report, A Scanner Darkly, V for Vendetta, etc. So what would have shocked the average American's conscience 40 years ago may now be almost expected. (This is the boiling-frog theory.)
5. There's a lot more inflation-adjusted $$$ to be made from the surveillance-industrial complex now especially post-9/11 than there was 40+ years ago. It may be an order of magnitude higher. More tax $$$ kicking around == more support in Washington officialdom.
I'm sure there are other explanations too but those are the first that come to mind...