I think you could be wrong with that. Just because the tall-clothes wearing skiers might be more vocal about their style doesn't mean that lots of people aren't changing. Hell, even Tom Wallisch is wearing button downs instead of tall tees these days. Friends are buying pea coats and classy jackets. These are the same people who wore the tallest hoodies and tees like 2 years ago.
But that said, Jiberish has enough of a following of people who like rad looking tall hoodies to ski in (including the athletes they sponsor). It wouldn't make sense to abandon that side of their company. They'll probably do that stuff in the winter drop (among other winter streetwear).