If the law mandates a MITM capability, and users in the EU don’t consider it important enough to oppose said law, there isn’t really a choice and the region scoped certs may be the only choice moving forward.
Outside of the EU, browser vendors will continue to ship browsers without eIDAS CAs, so just VPN into a non-EU country to download your browsers.
But you'll probably have to keep an EU version on hand in order to access EU gov sites, EU banks, and likely EU businesses if/when the EU government decides to force businesses to use eIDAS certs for their sites.
