I think two-digit years make sense now just like they did in 1980. The cost of carrying those extra digits all that time exceeds the cost of dealing with the century turnover. Think of all the systems that didn't even survive until 2000; 4 digit years would have been a total waste in them. What's the probability that the Linux kernel will still be around, released in the same way as it is today, in 2100?
I wrote programs in 1995 that could not survive the Y2K transition. Some had to be restarted after the turnover and others had to have minor code changes after the turnover, with minor work stoppage until that happened. Many were no longer in use. It was a net win.
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