Can you retire a millionaire with ETFs alone?

Can one realistically aspire to retire as a millionaire solely through investing in Exchange-Traded Funds (ETFs)? While ETFs offer diversification, low costs, and liquidity, is it feasible to solely rely on them to build a substantial retirement nest egg that reaches millionaire status? What are the key factors to consider, such as investment timeframe, allocation strategy, and potential risks, when planning for such a milestone?