[fjtorres]

The tipping point is here, indeed. At least for magazines.
Declining print volume means the print overhead costs (warehousing, transport, etc) are eating them up alive.
The smarter digital mags should try the old free-to-qualified-subscribers model of Infoworld and PC Week (among many other vertical market publications). And use direct email distribution.
That way they get the ad revenue, the metrics to justify the ads, and bypass the middleman.