There has been series of arguments, with different parties, trying to convince the SEC to approve bitcoin ETF (exchange traded fund), which would basically allow bitcoin to be traded as a stock.
This would off course increase the adoption of cryptocurrencies, as it will attract more players, who are wary of the market volatility.
It doesn't do much in terms of legitimizing bitcoin as a global currency, capable of rivalling the conventional currencies. And has little long-term effect.
And sectors a question, why is approval needed, when bitcoin is a decentralized platform?