I suspect some of is due to how amorphous the term white collar is. The BLS has job projections, https://www.bls.gov/emp/tables/occupations-largest-job-decli... , and they forecast large declines in admins and clerk-type office jobs that you would expect.
The fastest growing list on the other hand, https://www.bls.gov/ooh/fastest-growing.htm , has some office jobs, but it's dominated by healthcare jobs that some of which are kind of office-like.
There's also some weirdness, with Computer Programmer listed on the decline list, while Software developers, applications is on the fastest growing list.