A similar question was asked before in 2011 http://askbot.org/en/question/3249/how-scalable-is-askbot/ and it seems back then caching support was rather weak. Has the caching support been improved since then? Can Askbot handle 40 pageviews per second now?
Improved somewhat since then, probably 6-8 requests per second on a single process and average hardware.
Is concurrent reading better supported now? How about concurrent writes? Our site is expected to get about 15-20 pageviews per second.
Concurrent reading is not a problem just set up some processes in parallel, not sure about concurrent writes - never tried. You should have better performance with nginx + uwsgi or gunicorn or similar than Apache.
BTW, by average hardware, what do you mean by that? Something like a 'small instance' on EC2?
Like a standard VPS you can rent for under $20/month or a laptop small EC2 is probably about the same.
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How many page views per second do you have on your site?