As a result, it may not be helpful to see the organization as a given entity or structure at all, but as an ongoing process of organizing.

I think this is fundamentally right, but/and I also think it will take a long time for organizations to become "continuously fluid".

That said, I noted long ago as a consultant whose work with clients addressed / affected the boxes on the org chart, that changes to structure happened pretty often / regularly. So there was ongoing, rolling change in effect .. but the clients always assumed that the most recent, or next, decision would result in more-or-less the "right" structure.

The basic assumption operating then (and I think still semi-consciously at play today) was that there was a threshold degree of 'stability' that was just around the corner.