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I don't agree. One of the most important parts to expose extremists is to discover their motives. For a general internet surveillance there are not too many possible motives, which justify that kind of effort. Especially since it is not very popular.
As I pointed out, terrorism is not a sufficient explanation. There are far too few terror acts and most of them are
unorganized and not of the kind where internet surveillance would help. So not much of a career move here.
Child porn? More or less the same. Drugs? Sure, the small time street dealer has to coordinate with his upstream provider
when and where to get his next delivery. I am sure this is done by email. Most other types of cyber criminality leaves a money trail. Those can be followed even now. Fear of a revolution? Democracy works quite well. Most relevant countries have at least two parties. If one becomes unpopular, the opposition gets a chance. Masses are mollified. Rinse repeat. So the upper 10000 have nothing to fear. Snowden prevention? Maybe, but those attempts to control the net are much older than the Snowden even.

Now, if you factor all this in, tell me, what remains as motive? What remains where internet surveillance actually makes
sense? Where it could work? Who is willing to invest millions of $ to lobby lawmakers? Who is willing to stifle upcoming new
business models, which could create a new boom, e.g. like the vcr did when it become popular? Who does not care about
public appearance?