Comment Thou doth not use thee thorn this day. (Score 1) 86
Language is always evolving. The English language that would be more or less mutually intelligible to current speakers is only ~500 years old. The current grammar, punctation, and spelling conventions are even newer. Anybody who has read English language documents written before the 19th century by the most educated individuals of that day will see numerous examples of spelling that would be "incorrect" by today's conventions. As for the semicolon, it was only first recorded in the English language in the late 16th century (it was a new introduction when Shakespeare was writing his plays).
There are various ways to indicate a pause or disconnection within a sentence. Both commas and dashes can fill a similar role to the semicolon. Which is used is a matter of convention. The reduction in use of the semicolon seems to be at least partially a reaction to the overlapping use cases of these punctuation marks.
There's always going to be a tension between linguistic evolution and the need for established convention. If there are no conventions, then comprehension suffers. If conventions are too rigid, it can be difficult to convey the correct message. New concepts and circumstances may require new or evolving conventions. It's not surprising that conventions would change in the computer age.
Pretty much this. English is a living language and I've seen it change significantly in the 40 odd years I've been speaking it... Let alone writings from Victorian times or earlier. Sherlock Holmes "ejaculated" quite a bit, but when that book was written the word meant to say something excitedly. Obviously it doesn't mean that any more and that book was written less than 140 years ago.
Even reading some Arthur C Clarke or Asimov today there are marked differences in the way English is used, the definition of words changed as the context is different to what we'd expect. However English, being English means a competent speaker can still tell what the word means due to the context.
Languages change and evolve, punctuation marks like the pilcrow or even entire letters like the thorn ("Ye" olde is actual the, that Y is not a Y but a thorn that has a TH sound) or the defunct letter zog (which is still in use in some names like Menzies, which can be pronounced "Mingis" because it's based on an older language). If the semi-colon goes the same way, then so be it.
Which is why English will remain the international language long after another culture rises to dominate.