The premise of European payment system is that consumers are protected via law and payments are dirt cheap. While Stripe charges in USA charges 2.9% + 0.30$ per payment, an iDEAL payment (with Stripe) costs only €0.29, that's it. For a television of 1000$, that is hefty 29.30$ payment fee.
Since Wero will be EU wide, it is cheaper to integrate for web shops. Why go to Stripe/Adyen if with a single integration you can get the entire European Union? Don't worry, the adoption will be there.