The biggest Achilles heel of market cap weighting is people are kind of stuck in these positions and they get bigger and bigger. Theoretically, if you could sell out of them, recycle into for example small caps, smaller companies, that theoretically makes the ecosystem a little bit stronger. The current tax code creates a dead weight loss that traps capital in massive, appreciated mega-cap stocks because investors refuse to pay the capital gains tax to sell. As the financial industry scales tax-efficient diversification tools, this trapped capital will finally be unlocked and recycled down the market cap spectrum into under-owned, smaller companies. LONG. The proliferation of tax-efficient exchange funds and ETF conversions will systematically funnel capital out of the top-heavy indices and into broader, smaller-capitalization equities. The IRS cracks down heavily on Section 351 and 721 exchanges, keeping capital permanently trapped in mega-cap tech stocks due to the friction of capital gains taxes, or small caps continue to suffer from higher relative interest rates.