It's a move that makes sense - his business of allowing you to share and download files puts him at odds with authorities. Given this nature of this business his clients would motivated to use secure communications. He will be able to market to the sort of people who need privacy and have used his services before.
If you should trust him [1], and if you like him are another matter - but clearly there's a business opportunity for someone who can market to the megaupload crowd.
It should. But as many have pointed out here, in reality people need motivation, and most people don't have it. Sex, drugs, copying, political dissidence, etc. You have to start with a market of the motivated, who may already be using less-convenient tools.
I wish he would use his stature to promote existing solutions like Jitsi or Tox. That won't contribute to his bank account though, so it's a non-starter.
If you should trust him [1], and if you like him are another matter - but clearly there's a business opportunity for someone who can market to the megaupload crowd.
[1] https://anoninsiders.net/mega-960/
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Edit: Changed 'like' to 'motivated' as it describes the situation better (see Zigurd's comment below)