Permanently losing about 10% of the pilot workforce within the next 2-3 years is a realistic prospect for Europe. First, due to the aforementioned aging statistics. Remember that RYR and EZY are not representative of the big picture. The fact that most pilots there are young doesn't mean that it's the absolute same everywhere else. Second, it's an overestimation to say that every single younger-age pilot will go back to flying. A few percent of the redundant lot simply don't want to put their lives on hold for a couple of years and stack shelves or drive delivery vans until aviation recovers. Instead, they spend their time studying programming or whatever other meaningful stuff they can think of or building their own businesses and end up laying the foundations of a career which is no worse than flying in terms of remuneration and prospects. Obviously, the more established their new career or business becomes, the less willing they are to just dump it and recommence flying.