There seem to be 2 sides to this:
1) RSS (the reading utility) as a means to improve reading efficiency
2) RSS (the specification) as a means to pull content into aggregation and curation utilities
My un-educated guess is that most non-technical folks are unlikely to adopt RSS for the purposes of efficiency and discoverability (though it's hugely powerful if you have a bit of tech-savvy).
Where RSS and similar specifications will be incredibly important are for content curation utilities such as Zite and Flipboard, which go a long way to make discoverability easier for your average user. With the high noise-to-signal ratio in a content-overloaded world, I expect curation/aggregation applications to play a big role in discoverability.