The RE 650 is a unique case. A lot of us purchased ours with the intention of modifying the engines. I'll admit I was pretty upset when I briefly thought my bike was Euro 5, though the degree to which Euro 5 ECUs are completely locked down isn't clear yet. That being said, there's no real need to change the performance of most modern motorcycles. If you want to buy a fast cheap bike there are plenty of them that come that way from the factory, Euro 5 or no. And I seriously doubt Theresa May (or her ilk) cares all that much about what kind of mirrors Uncle Stu puts on his Triumph Bobber, so long as they're functional. Fillingham's video is boilerplate YouTube, full of the usual hysteria, ignorance, and click baiting.
The internal combustion engine is in it's last days, and probably should be. There will still be millions of gas-powered motorcycles available, though finding affordable gas in twenty-five years will be all but impossible, not to mention the restrictions that might be put on their use. I can't imagine what electric or fuel-celled motorcycles will be like by then, but they'll certainly be interesting. I'll be approaching ninety, so I'll probably be appreciating them from the sidelines.