exactly what I was thinking... Soo, just because some people stop blogging and move to other platforms everyone should? Screw that.
Of course, if you intend to use your blog to make some dinero and pay some of the bills, it's probably not going to work... but neither will twitter or facebook for that matter. If you just want to express yourself, use whatever you want and whatever your public will use.
And can't you have a blog AND twitter, facebook, etc?