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Should I replace bonds in a passive investment strategy
I have had similar thoughts regarding alternative diversifiers for the reasons you mention, but for the most part they don't exist.  Gold is often mentioned, but outside of 1972-1974 when the US went off the gold standard, it hasn't been very effective in the diversification role.  Cash can help a little, but it also fails to effectively protect you in a bear market, as measured by portfolio drawdowns as well as std dev, relative to gov't bonds. There are alternative assets, reverse ETFs, etc which can fulfill a specific short term defensive role in your portfolio, but which can be very dangerous and are especially poor as a long term solution; while some people claim to use them for effective results, I haven't seen anything verifiable. I don't recommend them. Gov't bonds really do have a negative correlation to equities during periods in which equities underperform (timing is often slightly delayed), and that makes them more valuable than any other asset class as a diversifier.  If you are concerned about rate increases, avoid LT gov't bond funds.  Intermediate will work, but will take a few hits... short term bonds will be the safest.  Personally I'm in Intermediates (30%), and willing to take the modest hit, in exchange for the overall portfolio protection they provide against an equity downturn.  If the hit concerns you, Tips may provide some long term help, assuming inflation rises along with rates to some degree. I personally think Tips give up too much return when equity performance is strong, but it's a modest concern - Tips may suit you better than any other option.  In general, I'm less concerned with a single asset class than with the long term performance of my total portfolio.