"I'd be more worried about the murdering bastards that were born here..."
The government you mean?
The points about re-prioritising traditional intelligence seem reasonable, though I suspect that they're just not doing very well at that, hence resorting to other methods.
I'd also suggest that given that England is really quite comfortable and Syria is not, asking them selves why not just lone terrorists, but even mothers with Children are trying to go there is also a worth while exercise.
Lastly I'd point out that given the recent banning of much porn the average citizen is going to be using a VPN. This in turn will mean that just investigating everyone using a VPN is of no use. As is investigating everyone using TOR, when every student and his non-technical mate is using it to procure their drugs.