Andy, I appreciate what you're saying but I don't think it is a case of there being a dearth of descriptive writers, more a case of lack of demand for them.
Waterlog magazine tells you the whole story in that its pages are full of descriptive writing but it is distinctly lacking in 'how to' features. Its circulation for two months is about 6000 copies, if that. At the opposite end of the scale is Improve Your Coarse Fishing, which has little, if any, descriptive writing while near enough every page is a 'how to' piece. It has a circulation figure, for one month, of over 60,000.
The vast majority want to learn while some old farts like me want to be entertained. If the tables were turned then you would see many more descriptive authors come out of the woodwork, or some of today's 'technical' writers become more descriptive. Perhaps not with the penmanship of Chris Yates, but certainly with more eloquence than they presently display.
Magazines these days have to have a certain 'style'. Waterlog is about good prose while IYCF is about teaching beginners and improvers. And they won't stray very much from those aims, being bound by policy, budget, etc.
Now, although the internet is far removed from those wistful scenes described by Yates and his ilk it may be just the answer to many angler's prayers. You see, within reason, web pages have no restriction. There is no limit on the 'print run', no budget as such to restrict the number of pages, and so there is room in this, and I would imagine, other angling websites, for all kinds of writing, from prose to procedure.
So, if some of the more descriptive writers wanted to 'flow' then they most certainly have an outlet.
I would imagine, however, that few of those who think Waterlog is wonderful and wouldn't dream of buying a 'how to' magazine, have bridged the void between cane rods and carbon rods let alone quill pens and PC's.
So it may be quite some time before they realise that there is another form of media other than the printed word.
I did say 'few' remember, for I know that some of the contributors to this forum have enough scope to enjoy cane rods and carbon rods, along with pens and PC's.