If we expect novels to mimic nothing more than casual conversation, we lose a whole depth of creativity. While us readers lose sense making tools.
I believe new writers are gravitated towards present tense mainly because their cultural world is in present tense. I bet they are exposed to twitts, blogs, films, TV, etc much more than to novels.
So I believe they adopt the style of these media, because of naturalization via immersion. Even in the article, most answers of writers to why present tense, are 'it just happened' and then rationalized.
For me, it is another proof of the "medium is the message" theory. I believe we are losing thought technology.