My concerns did not come from the sources you mention above but from the UK based 'Digital Photographer' magazine. In issue 43 in their otherwise positive review of the new EF-S 60mm Macro they say "the only other concern we have with this lens is Canon's long-term commitment to this mount, considering its stated intention to pursue the development of full frame digital bodies as the price of the technologies drops. How many more camera bodies this lens will fit in the future is open to conjecture, as is your own likelihood of upgrading".
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To be blunt (about that magazine, not you), a lot of photographic magazine writers belong squarely in the peanut gallery in my mind; so many of them are part of an old guard of 35mm and medium format film enthusiasts who are in denial about the realities of digital technology and the direction in which it is driving the photographic market place and product designs. These are the folks who a few years ago were telling us that it would take 40M to match 35mm film, and who keep telling us that SLR formats smaller than 35mm suffer a "wide angle crop disadvantage", as if they are totally unaware of the new wide angle lens options of Canon EF-S, Nikon DX, Olympus Zuiko Digital, Pentax DA etc.
(Aside on the wide angle "problem" of the new DSLR formats: Canon's 10-22 EF-S goes as wide as any 35mm format zoom from Canon, Nikon, Pentax, Konica-Minolta or Olympus; the Olympus 7-14 is for the even smaller 4/3 format and yet goes even wider, as wide as any 35mm format rectlinear lens, prime or zoom, from any of those major SLR makers.)
The bottom line reality is that Canon's EF-S DSLR system is probably the best selling SLR format of all time, and its share of Canon's total sales has increased in the years since the introduction of the 1Ds, despite the addition of the far more afforable 5D to Canon's larger format options.
To paraphrase Groucho Marx, "who are you going to believe, some magazine writer's fact-free speculation or your own eyes?"