Very soon, no more international business travel.
The market will adapt. You'll see laptop rental services spring up overnight for international travelers to rent at their destination. You'll see international travelers moving all their computing to the cloud. Airlines will offer non-battery powered devices (for an upgrade fee) to use in flight, together with wifi (another upcharge).
Using a rental laptop won't work for some, so you might also see laptop battery rental kiosks at airports outside the security cordon so that you can rent a battery during your international stay and use the power cable on international flights.
You might also see small computers similar to Raspberry Pi (but likely with more power) become popular. Plug it into the usb port available on seats on international flights and use a separate keyboard.
Finally, you could see airlines requiring separate checking of laptops to be placed in secure cargo holds with fire suppression built in. Also much more expensive, increasing ticket prices, but if the regulation happens the airlines will do whatever they can to keep international business travel.
All of this sucks, but people will travel to do business and they'll figure out a way around it.
Sorry, but there will be business travelers to use their laptops. They will be preapproved. For a fee.