From beginnings that we might date to around the mid-1970s, PC sales (and development) went on an uninterrupted upward curve right through
From <https://www.nzherald.co.nz/business/news/article.cfm?c_id=3&objectid=12163894>: ... global smartphone sales saw their first year-on-year fall in history at the end of 2017. Apple seemed unaffected at the time, but its latest quarterly results now show falls in unit sales, as a result of which it will stop reporting them in future. the 1990s, only starting to stutter around about the 2000s. The smartphone revolution, even if it includes the Symbian era and not just Android and Apple, has not lasted quite as long. So what new information-processing technology will ignite the mass market next? If any?