Not necessarily - a good chunk of the tech firms has been around for a long, long time and they aren't going anywhere soon. Apple, MS, Oracle has been around for more than 30 years - IBM much, much longer than that. Google will probably be sticking around, not so sure about FB.
All true, but in both fashion and technology, things can change very, very fast. The business is full of stories of companies who went from leading the market to being little more than a historical footnote in the space of a few years. Atari, Nokia, Sony, and many others once seemed unstoppable, but were either bankrupt or shadows of their former selves in the space of a few short years. And let's not forget that 20 years ago, it seemed quite likely that Apple was done for.
Nearly everything Apple sells they will not be selling in five years time, so they either have to update their existing products and convince people to pay for them (not always a viable strategy, as MS is discovering), or come up with new products entirely. Obviously they have been absolutely brilliant at this since the '90s, but that doesn't mean they will continue to be so indefinitely.
As for H&M, from what I gather, they don't really have much of an identifiable style of their own. They're in the business of providing low-cost fashion-of-the-moment items, and usually just copy current trends rather than trying to define them, and their efficiency in logistics allows them to do this faster than most in their business. So I would think their big challenge is not so much about being "trendy", but potential competition from other low-cost clothing retailers. The way I see it, it's the higher-priced trendy clothing shops/brands which really have to worry about trends, because if they wrongly gauge where trends are going and/or become associated with a past era, they are
finished. H&M can still count on some business from people who just want cheap clothing, whether it's in style or not.
In any event, predicting who will disappear and who will survive in the long term, regardless of the industry, is a bit of a fool's game.
This exactly. There's really no telling where things will be in ten years.