I think the lesson here is that in the set of [webcomics with unpronounceable four-letter names] LW leans more toward xkcd than smbc.
For one thing, if Munroe made that joke you know he'd have actually done the math.
Too bad he stopped being funny a few years back, while smbc is consistently great and covers the LW-relevant themes in a lot of detail, though I won't risk linking it here.
Here's a great article by Paul Allen about why the singularity won't happen anytime soon. Basically a lot of the things we do are just not amenable to awesome looking exponential graphs.