The Internet is a wonderful piece of software! Even though being designed many years ago, the architecture still scales and definitely showed that is is very future proof!
The Internet could grow that much as it heavily makes use of the abstraction principle. Everything is encapsulated in to building blocks. Parts of the communication stack can be exchanged without affecting those above.
If you want to learn about the powerful design of the Internet, take part in our free edX MOOC “iLabX – The Internet Masterclass” today!