The $15 trillion dollar market will be for those who are willing to think outside of their technical, ideological and political bubble--and embrace the mainstream.
If only tapping to that market was that easy. Markets get saturated with scams and tokens that live for a day or a week, and number of projects that aren't going anywhere even if they now are high on the marketcap is going to be significant. Choosing the winners isn't going to be easy.
I think big players* will emerge who will build a reputation with consumers for fairness and safety. eBay did this for online auctioning of physical things, and they (or "we", since I worked there for many years) deeply emphasized consumer safety on the site, making it so most end-users didn't have to worry about getting ripped off. This
safety is what opened the door to online auctions to the mass market, because average consumers in a hurry could buy and sell without worrying about anything.
But yes, choosing winners is never easy--but that's true for everything, right?

(* Full disclosure: I hope my company becomes one of them

).
That peaked my interest as well, so first i tried to look at coincards.com, because it has my country listed in their services. I chose a rather famous web shop that i have used before, and went to choose the amount for gift code. But first i checked the TOS, and coincards is fully complying with regulators, meaning that monero is living there with a borrowed time and change to get my account frozen is real.
I had left that out of the Monero discussion, but it's a good point that reinforces what I have been saying about the market: Monero itself is viewed in a very negative light, and while I have a lot of respect for it technically, when a product becomes known for things like
cyberextortion,
terrorism,
money laundering, and other criminality, businesses who cater to a mainstream audience aren't going to get anywhere near it.
As I keep saying here, the "keep your stuff secret even if the government is after you" business is really, really small. It's a "niche market" at best, and a purely illegal one at worst.