- has not been growing exponentially; instead, growth is a "straight line";
It's worse than that. Not only is growth in article numbers linear, median word count per article is decreasing fairly rapidly so it would seem they're just writing stubs. I would advise you to try and avoid that - the only way you are going to attract readers away from Wikipedia is if your articles are significantly better quality, you will never match us for quantity (well, not for a few years, anyway, and as I said before it's the first 18 months that matters).