That's certainly true, mate. While Blockchain technology is still new to the world, it's growing at a fast pace. Eventually, it'll improve to a point where it'll rival traditional payment processors not limited to VISA such as: Mastercard, PayPal, MoneyGram, and even Western Union. The diverse number of scalability solutions available today, makes it possible for Blockchain technology to beat VISA someday. It just needs to gather massive mainstream adoption and regulatory compliance, to outmatch its competitors.
Right now, one technology which looks to be Blockchain's successor is DAG (Directed Acrylic Graph). There are only a few cryptocurrencies in existence which make use of such technology for infinite scalability. Such cryptocurrencies are: NANO, IOTA, Constellation, Coti, and Hashgraph. They have near-instant transaction confirmation times and are virtually free (no fees). This means, that they could overcome VISA in terms of worldwide usage, if people start to adopt them at a large scale.
As for Bitcoin, it will be possible to process millions of transactions per second with low fees using the Lightning Network. SegWit has been activated already, but it still lacks mainstream adoption at a large scale. The process has been slow, but once there are many businesses and companies using SegWit, the Lightning Network could go full steam ahead. Even now, the Lightning Network is in testing phase not ready for the world. Once it does, then Bitcoin could have a better chance of rivaling well-known payment processors in the mainstream world.
Nonetheless, time will tell us what lies ahead for the future of Blockchain technology. Just my thoughts