I think Ventiles popularity can be ascribed to folk discussing it on forums, TV personalities wearing it from time to time etc...
Well yeah - I have been on telly a couple of times... but mainly in Welsh soaps and in Lovejoy - I dont think you can realy call me a TV personality though
I would like to think that my contribution to the popularity of Ventile is more about the design work I have done (even my Btec OND final collection of "Resort Wear" was in Ventile - I got a distinction! - my double layer Ventile Motorcycle/mountain jacket was also well recieved by some) and the reviews I have written for the outdoor press.
I do not backpack anymore so I cannot realy talk about the current fashions there but when I go out on the hill or in the fields/woods I find that I wear my Ventile for the vast proportion of the time - it tends to either be fairly windy even if it is not raining and most of the rain I encounter is either drizzle or showers (unlike some I have the good sense to come in out of the rain - or is that the good fortune to be able to plan my days out with an eye to avoiding the worst of the downpours).
I find Ventile copes admirably with these conditions and if I encounter rain that overpowers the fabric then my poncho (which also serves as a lunch/emergency shelter) is deployed.
I have never found Ventile particularly heavy (but when I started backpacking the jacket I wore was neoprene proofed nylon and my tarp was rubberised canvas!) or bulky, I find it dries out well overnight near the fire and is so darned quiet and comfortable that I can realy enjoy wearing it. Ventile is easy to repair, lasts decades of abuse and is more breathable under most conditions than any "plastic fantastic" fabrics.
I will wear Gore etc (mainly for magazine review work) but always return to my Ventile for my own personal preference wear.
I have been wearing Goretex from the time it first apeared in the UK and compared to Ventile it seems pricey, fragile, uncomfortably sweaty and noisy - unless teamed with a multitude of other top spec fabrics and the lighter the version the nastier it seems to wear!
As to Pile and Pertex - I find it a superb combination but unless it is realy cold then it is just too much for me to wear. I have been using Buffalo gear since it came in 2 tone grey Pertex with a red pile lining
and Buffalo still use publicity photos of me wearing it while swimming in the Tivy Marshes during a major evaluation of the system.
As part of my work relies upon being reasonably in the know on fabric developments in relation to the Outdoor Trade I try and keep up with new ideas - but I have yet to find a fabric that is not a host of compromises and for my Bushcrafting and most of my other outdoor activities (which range from woodland strolling to canoeing to moderate hill walking, birdwatching/wildlife observation, the odd bit of shooting, photography, cycling and more) I find Ventile to be the best of the bunch.
For the modern brand of backpacker then I can see that Ventile may be a bit heavy and bulky (in my backpacking day the packs were bigger, the loads heavier and the packers accepted this) and for exped work too, the natural fibre crew may be at a bit of a slight disadvantage weight/bulk wise ... but for general bushcraft then I still rate Ventile over all other fabrics!
Ventile is stil used by members of The Antarctic Survey, helicopter rescue crews and other pro users in preference to any modern fabrics ... so I would imagine that Scott would have chosen it for his kit even today
though he may have chosen lighter sleeping bags....