Some investors love ETFs so much that they just can’t see themselves buying anything else. About 62% of ETF investors can envision building an investment portfolio made up of just exchange-traded funds, according to a recent Schwab study, while 50% said they could be fully invested in ETFs within the next five years. As investors move into increasingly cheaper alternatives, the research highlights the diminishing role that mutual funds play in portfolios, as issuers introduce new strategies to keep up wit ...