However, WisdomTree's Global Equity model could prove durable because several of its components are dividend ETFs, including the WisdomTree U.S. MidCap Dividend Fund (NYSEARCA: DON) and the WisdomTree U.S. SmallCap Dividend Growth Fund (NasdaqGM: DGRS). DGRS and DON are dividend growth strategies, which is relevant in inflationary times because payout growth historically tops inflation. All good things don't necessarily need to come to an end, but the 60% equity/40% fixed income portfolio structure that was such a cornerstone of investing for decades may be on borrowed time.