I think the next season will be just as popular, if not more so. Only difference would be manufacturers better prepared for the demand.
I ride year round, so I dont care. Other than the fact my bike is always caked in grit and dirt, lol.
i think that the tooth count of each specific cog would be more important than how many gears you have total. As well as chainring tooth count, of course.
Otherwise, I find that vintage bikes seem to be made using higher quality and more durable materials.