Hi Gatordoc.
I don't think things are nearly as simple as you lay out. We went through a sharp Fed Fund rate rise from 1% to 5.25% in a pretty brief period, from 6/04 to 6/06, yet intermediate bond funds did not suffer nearly as drastically as one might expect from simple formulas. The fact is that short-term, intermediate-term, long-term react differently in each rising rate environment, and differently again among the different bond types.
Here is a good view of three rising rate environments that occurred since 1993 and the effect on different types of bonds:
http://www.rwbaird.com/bolimages/Media/PDF/Whitepapers/investing-rising-rate-environment.pdf
I expect that before long, I'll be adding to my bond funds because they will have dropped somewhat in value, giving back some of the tremendous capital gain I have already enjoyed since 2000. But that's just the name of the game in rebalancing and doesn't overly concern me. And it won't likely be a single direction move either - but rather a bumpy ride, going back and forth as economic and market conditions change this way and that.
And if there is a sudden jump in interest rates that hurt bonds badly, that is just as likely to be very hard on equities, so we're back to a nowhere to hide situation. You just have to keep rebalancing as things zig and zag to minimize the volatility.
And I haven't written off the possible Japan scenario of interest rates staying low for a considerable amount of time either. You just never know.