If for friend has an iPhone you will automatically send her an iMessage, if not you send a text. You won’t even notice. (The “Send” button changes color. That’s all.)
(Yeah, TechCrunch is exaggerating but iMessage is very clever.)
SMS isn't going anywhere soon.
Either way, I've never seen a breakdown of SMS usage by either category.
I haven't had a text plan on AT&T for many months, mainly because I use Beluga to send texts to my friends. iMessage is similar but much more seamless. I have saved hundreds of dollars by paying for the few text messages I still send/receive as I go.
Also: I don’t think an iMessage is 1MB.
So now all my private messages get routed (and logged) through an US company?
If you like you can obviously deactivate iMessage. It’s not a problem.
By the way iMessages are encrypted end-to-end (but I wouldn't expect you to believe or trust Apple on this).
Some governments > US governments on issues of privacy and propriety ..