You're missing two points:
PRISM is one program. There are many others out in the wild (as per Snowden leaks) that don't rely on bulk data collection. This dragnet you talk about is meant to do exploratory investigation, yet intelligence methods also apply to targeted data collection. Discriminating factors in this data (e.g. the fact the user is inclined to opt-in) make it the more interesting for targeted collection, although some might disagree and argue the contrary also holds true (people not encrypting data not to raise suspicion).
Secondly, encryption by default burdens the actual relevance of the data. In the statement I made, conspiracy theory, XKCD comic, name it what you will I am also implying PRISM becomes more effective, as enabling the collection of data that is decryptable in due time renders it usable. Add the fact that opting in is made post-flashing/initial setup so the phone is exponentially more likely to have a connection to the internet during the process of opting-in/encryption. Run-time generated key is thus more likely to be passed around the cloud like an Indian smoke pipe that agencies drag from middlemen (Google) whenever they feel like getting a proverbial high.
This has all the nuances of Android file system's own version of a warrant canary: it was there, by default, until it wasn't.
Makes it easy for the NSA to distinguish those that feel the need to encrypt their data, and those who don't. I'm betting this flag is passed to Google's server for some business logic reason (reason being "unspecified" due to non-disclosure of law enforcement requests).
"there is a huge variation in ability between competent programmers and exceptional ones, and while you can train people to be competent, you can't train them to be exceptional"
This two sentences are the most blunt truths an IT professional has to cope with. 10x programmers just render us regular 1x programmers pretty much useless. If I lived in the US, and I had been raised as right-winged patriot, I would trust the local 10x are enough and some local 1x deserve to occupy 10x positions and salary slots.
But even if that's not the US picture, you don't want companies full of 10x's - it's proven to be hard to manage and to hinder company growth in the long run. Many will be headhunted, and many will leave.
If a company needs to be constantly looking for 10x programmers, it should be big enough to look for them locally. Unless it doesn't want to be paying the salary they deserve. This way you can fool a "foreign 10x" with the "El Silliconado" promise. Add some free housing, fast lane green card and a not-so-above-average salary, topped with the "I work for (e.g.) Google" factor. And that's how you're set for some long-term consequences when they to go back and fund their own 1B companies in Mumbai/Warsaw/Moscow/Beijing/Seoul, and start siphoning the local 10x and the local industry profits.
So, (potentially) a quarter more class A narcotics entered the country due to (potentially) a quarter of the communications intercepted no longer being so. For one, I highly doubt those numbers translate to effective raise in class A narc. consumption or even availability. Let's not forget Snowden's actions also alerted the criminals, so they are EFFECTIVELY more aware, and thus LESS active since.
In any case, the number of drug addicts does not always increase with availability. Some studies actually indicate consumption is most influenced by other factors such as popularity/public opinion, novelty or ease of access (it's still socially difficult to contact dealers, thankfully). Some pioneer regions are proof availability is a deterrent for substance abuse, or induce more responsible use (Netherlands anyone?).
But even if I'm totally wrong, I'm personally happy with the trade off. I'll give in a few communications between criminals going undetected, for the assurance of private, universal communications any day.
Just spend the extra money on proven deterrents of narcotic use. Like prevention
Lots of folks confuse bad management with destiny. -- Frank Hubbard