I'm hoping DAG-based cryptocurrencies will be able to provide the transaction speed necessary for consumer transactions to be practical and we'll see stores actually take cryptocurrencies directly. If so, we'd just need someone ambitious enough to make the payment terminals and hopefully stores will see tiny/zero transaction fees as enough of an incentive to switch.

To add to your list of points, I'd argue privacy is another thing crypto as a whole hasn't really taken seriously apart from a small set of cryptocurrencies. How many people want to dish out their address to stores when this implies they can see their history and with it way too much metadata like where you spend/earn, how much you spend/earn, and so forth.