Mitsubishi, part of the "Big 3" (Nissan, Renault and MMC) have decided they are no longer going to design vehicles to be Euro 6 Compliant, and instead will focus on the growing market in the Middle East, Australia and the US. Their statement lacked a lot of detail, Launch season next month will tell a lot with regards to where MMC are going. With many countries deciding to completely ban ICEs within the next 15 years, maybe they are just stepping aside to see how it pans out. I heard mention before to ramp up production to change from building a mix of ICE, Hybrid and EV, to just building EV, could take up to 15 years for manufacturers. There will still be plenty of EURO6 compliant Mitsubishi vehicles sitting in storage around Europe, probably enough to cope with market demand for 2021 at least, though we won't see the new shape Outlander here.(Launch in Feb).
We may see a new breed of Mitsubishi which will be re-badged Renault or Nissan designed vehicles for the European Market. I.E New Nissan X-Trail will be badged as Mitsubishi Outlander., New Qashqai as Outlander Sport etc, giving Nissan a chance to get designing next gen vehicles for a changing market.
It isn't uncommon. I remember around 1996 the VW passat was identical to the Skoda Octavia, which was identical to the Audi A4. Only difference was trim and the badge on the steering wheel.
Same with the Mazda 121 and the Ford Fiesta from around the turn of the 21st Century. Renault and Nissan also shared engines for years (leading to reliability issues with certain, previously bulletproof types, but that's a whole other story).
At the end of the day though, Mitsubishi will continue to have a presence here for the duration of all current warranties.