According to his personal wikipedia page (which are never entirely reliable):
> "Engelbart slipped into relative obscurity by the mid-1970s. As early as 1970, several of his researchers became alienated from him and left his organization for Xerox PARC, in part due to frustration, and in part due to differing views of the future of computing. Engelbart saw the future in collaborative, networked, timeshare (client-server) computers, which younger programmers rejected in favor of the personal computer. The conflict was both technical and ideological: the younger programmers came from an era where centralized power was highly suspect, and personal computing was just barely on the horizon."
Now both concepts have become more-or-less fully developed with a wide variety of small personal computers from RPis to desktop powerhouses, as well as rent-space-in-the-cloud client/server approaches. However, you do need to have a lot of faith in the overall power structure not going down some authoritarian rat hole to rely solely on the latter.
His ideas are certainly interesting and still relevant today:
> "Consider a group's Collective IQ to represent its capability for dealing with complex, urgent problems – to perceive and understand them adequately, to engage the stakeholders, to unearth the best candidate solutions, to assess resources and operational capabilities and select appropriate solutions and commitments, to be effective in organizing and executing the selected approach, to monitor the progress, to be able to adjust rapidly and appropriately to unforeseen complications, and so on."
https://dougengelbart.org/content/view/194/