It depends on the industry. High-volume consumer electronics is often like this (they're making this year's product, they roughly know the demand, they'll be re

It depends on the industry. High-volume consumer electronics is often like this (they're making this year's product, they roughly know the demand, they'll be redesigning it in a year or two), but industrial electronics generally wants to know that they will still be able to buy the parts in 10 years, at least (a design or even a single unit can be in active use for decades).