My vision for snort is to have a collection of widgets to be added or removed at will so people can customize their experiences.

Besides the obviously insane amount of work for developers, the current challenge is to stick to the vision without deviating much (of course I'd prefer we don't deviate at all).

But, besides that, there are other monumental challenges such as better discovery of content and people. That has technical limits - the design itself is not that difficult.