Distrokid has been out for a couple of years now and it's easy to see that it's pretty damn popular. Sure someone can get a team together and create the next Distrokid (I'm sure it's happening), but they'll be behind a couple of years. By that time, @Pud will have made his millions and onto the next...
Yup, they have the userbase already. Also, they disrupted the incumbents by being an order of magnitude cheaper (or cheaper than that, based on how many songs you're selling) than their competitors, which helped their userbase grow.
It's hard to imagine a new competitor being able to compete with DistroKid on price at all, considering how cheap they are. An order of magnitude cheaper is probably out of the question. And these numbers (for the larger clients) are peanuts on DistroKid anyways, so even if you could compete on price it might not matter for much of the market.
I agree for price, you can't really beat Distrokid but disruption can come in other forms. Other competitors may think of better features, more connections, or simply better marketing. I don't know.
