Norbert Schlenker wrote: This is market timing, pure and simple, and I cannot advise anyone else to do anything so foolish.
Cheer up, Norbert, you're only human, after all.
Triumph of the Optimists, by Dimson et al, show real return on bonds in the U.S. averaging 1.6% from 1900 to 2000, and 1.8% from 1950 to 2000 (a more relevant period). For Canada, the corresponding numbers are 1.8% and 2.5%. For Australia, they are 1.1% and 0.1%. In all three countries, many decades have a negative average real return.
So I don't see anything unusual about 1.5% or the current 1.7% in Canada. But of course I don't believe I can predict future returns.
More importantly, I fully expect the nominal yield on a RRB to be lower than the nominal yield on a regular bond. After all, I have defeased the risk of unexpected inflation. And I am willing to pay for that risk reduction -- at least a half percent per year, and maybe more.
Perhaps I am unduly bothered by the risk of unexpectted inflation. But it certainly exists, as Dimson's numbers show. I am buying what, to me, seems like cheap insurance. Unfortunately, many holders of RRBs don't even realize that this is one of the main benefits. Heck, some don't even know what inflation is.
AS to your three points. If you really expect a boom, with stocks about to take off, surely you should be puttiung your money in stocks, not nominal bonds. It seems to me that one should have a "bar-bell" portfolio, with RRBs for safety and QQQs for appreciation.

(All right, some SPY, etc, just in case.)
Your second point postulates that rising nominal rates will lead to some rise in real rates as well. That is certainly plausible in the very short run -- nominal interest rates are more volatile than inflation. But I wonder if it remains true for periods of a year or more. Over such periods, I would expect that some investors, at least, will be scared by unexpected inflation and will seek out RRBs, putting upward pressure on prices. Just :speculation, of course.
Yopur third point is that RRBs are a fad investment and that fads should generally be avoided. An interesting contrarian position, and one that I have some sympathy with. But I don't really care why others buy the things. I believe (perhaps wrongly) that I understand them, and that I am holding them for good reasons. As to the possibility that fads end, and that there will be a selling spree, yes, of course, that is possible. But RRBs are not very volatile in ordinary times, and so the trigger for the sell-off is less likely than for, say, the tech or the energy sector of the stock market. And since I am holding for the long term, it does not bother me anyways.
Your implicit fourth point is that TIPS look more attractive than RRBs, so perhaps one should concentrate on TIPS. I agree that TIPS are a wise diversification from RRBs, and I do hold some. But the majority of my holdings is in RRBs. You yourself gave me the reason some years ago -- avoid foreign exchange risk. After all, I plan to live out my remaining years in Canada, spending Canadian dollars. Why should I incur the risk of adverse movements in FX rates? And all for 0.5% a year?
Georges
The plural of anecdote is NOT data.