Technologies like atomic swaps are making possible a world where many cryptocurrencies will rule.
In the 1980’s and early 90’s, most businesses had a LAN, or “Local Area Network.” This technology allowed a company to connect computers in a network, usually in a very limited, local area. Some larger companies might have employed a WAN (Wide Area Network), which covered a bigger area, but was still mostly confined to a single corporation’s computers. A challenge for IT professionals in that era was how to safely interact their LAN’s with other company’s LAN’s. Many tech articles were written and many attempts were made with limited success. Then the Internet became ubiquitous and the problem was solved. The idea of disparate, incompatible networks is now unthinkable.