The computer is the greatest automation tool for office work, and that scenario is obviously not the case if you look at what happened to the PC revolution. Local area networks with various file and application servers were a huge market for small and medium sized businesses, and there was lots of hype similar to what you are describing. Now everyone is back to centralizing on virtualized remotely leased computers, just like small and medium sized businesses used leased time-shared (and for IBM 370 series, virtualized) remote mainframes in the 1970s.
Same thing happened with the centralization of the automobile industry in the 1910s, and is happening today in the centralization of agriculture: better combines, tractors, Round-Up pesticides etc. are all available to family farmers, which are all being bankrupted by large factory farms.
Of course, there's also an interesting worry that's not connected to jobs here, namely, whether we may end up in a new age of SaaS companies selling automation to small and medium sized businesses as their main business model. Imagine if instead of large companies using tech alone, or people buying these machines alone, the likes of Google/Amazon/Microsoft/whatever started leasing them through an AWS esque service for X amount of dollars a month. We've already got Maker Labs and what not, this could be the future for that.
This is basically Marx and the theory of capital, e.g already describing our world since industrialization.