Yes, this is true. People who use Robbinhood trade stocks so they would treat crypto the same as they do stocks. Also, new investors in crypto would feel more comfortable using Robbinhood because they don't want to worry and learn about wallets and protecting your btc and all that. People like us want to hold actual bitcoin, because we know its better and already know how to do everything. Anyway the main point is like you said its great for getting in and out and it will still spread adoption.
RE: Robinhood App the Next Coinbase?