Marketing is wide as a course and has different sub subject under it, from digital marketing, telemarketing, advertisements, branding and packing etc's .
Cryptocurrencies should be regareded as a course in marketing and taught in schools as a subject for marketing disciplines ,it will help build foundation and give a basic knowledge & understanding to the students and make everyone see how vulnerable cryptocurrencies have become.
Marketing means that one wants to sell things. Marketing is more like advertising. I think that it's an inappropriate section. I think that most need to understand money, not how to sell crypto.
So most of the people may need actual financial courses, not marketing. People would need to know how to handle better their money, no matter it's fiat or crypto. And this kind of courses are missing in most schools.
However, I think that even if this kind of courses would exist, they may be highly biased towards fiat and against crypto, since those teaching them would have a certain age (i.e. most not open to new) and a certain background/education (and I keep telling that people into finances/accountancy don't understand bitcoin).
Hence unless there's a teacher with a lot of willingness and open minded, this cannot bring anything good.
And such teachers do exist, but too few; @titular is one such example. He taught his students how to use Electrum and more:
https://bitcointalk.org/index.php?topic=5378518