The main effects I can see are:
- Less business and tourist travel to the US.
- Higher costs for US based businesses, since they have to provide travel devices for both US-based and overseas-based employees*, and additional costs due to employee time spent preparing devices for travel. And more difficulty in finding foreign business partners due to all of the above.
As a non-american, I therefore support the ban, since it makes american competitors of my countries companies less competitive.
* My (US-based) organisation is already doing this, many employees are travelling without devices and/or wiped devices. And people are avoiding travel to the US. The in-cabin-laptop ban will probably just increase the proportion of employees travelling without devices to 100% (some don't mind the CBP too much, but do care about theft/damage in the hold).