The measures are highly likely to enhance the attention and accessibility of altcoins among traditional investors. As a well-known trading platform, Nasdaq's proposal to include XRP, SOL, ADA, and XLM in its cryptocurrency benchmark index signifies that these altcoins are making strides into the mainstream financial sector, attracting more interest from traditional investors. If approved by the SEC, the Hashdex ETF could invest in these cryptocurrencies, further increasing their liquidity and market depth, lowering investment barriers, and enhancing accessibility. Regarding portfolio strategy, if approved, it may be worth considering an appropriate allocation to these altcoins for diversified returns, but one must be cautious of their high volatility and regulatory uncertainty.