Hey MaxwellSmart,
Yep, I find it a really interesting topic. There are good studies out there by many people, including a really interesting one on global CAPE by Mebane Faber.
http://papers.ssrn.com/sol3/papers.cfm?abstract_id=2129474
I also saw (can't remember where) recently a chart which showed (similar to the one in the PIMCO link you provided) the "total return" decomposition of stocks over the
very long term (I think since 1800s?). They displayed that investing in stocks for capital gain was for a while the "new normal" and how before that the majority of returns were provided by dividend yields.
From the valuation forecast perspective, this makes intuitive sense, if your growth trend in earnings is 0% then you will likely only see returns provided by dividends. IIRC prior to the great "liquefaction" of financial assets which occurred after the inception of Central Banking and World Wars, the economy itself had pretty flat growth.
I would love to hear what the value investors of this forum have to say on the topic!