With my current job we started doing 1-2 days of working from home a week over the last year or so. Doing it part time has given me a chance to develop the skills and space needed to be successful and now that we are being pushed into it full time I feel a lot more prepared for it.
I do agree, though, that for most people who aren’t used to it or haven’t had a chance to develop the skills needed it’s going to be a rough transition and productivity is likely to decline, at least temporarily. Some of that may be due to working remotely, but I’m sure at least a part of it is just due to the general circumstances and anxiety surrounding it.