In your analogy, " the internet" would be digital currencies while Bitcoin itself would be something like SSL or http. Absolutely Bitcoin can become antiquated. You'd be wise to keep your antenna up for the next big thing, or your money could go to zero.
Discussion
Keep an eye out for the next globally connected network. Your computer might turn into a brick.
Quick reminder that the “current established bitcoin” (core v30 majority) allows arbitrary non-monetary data up to 100kb to be appended into the chain. People are debating this, and a fork may arise as an attempt to change the system. So yes, you better keep an eye out, because if your only motto is “bitcoin will always rule” you will end up inside an outdated system.