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Well, every Vanguard Target Retirement fund is a combination of the three funds in the article plus Total International Bond so... they already kind of do?
Another great article that goes more into 1999 Janus - what a time to be investing...
https://www.thestreet.com/story/880027/1/janus-extraordinary-1999-powered-by-small-group-of-favored-stocks.html