This year's situation is not a coincidence. Real Madrid, who transferred young players years ago, did everything on the way to their goal. They needed Mbappe this year and they got him. They don't need anything on paper right now. They had a great year and are fully prepared for the new season. They will show off in La Liga. Even the reserve team played magnificently in the match. They may have lost, but I think it was a successful match.
Of course this is not a coincidence, but this is a form of realization of what they planned. For example, in recruiting young players, they did it long before the mainstay senior players left. Let's say Kroos decided to retire now, before they lost Kroos they had prepared many young players in the midfield. Although perhaps in terms of ability they cannot match Kroos' performance, in terms of potential and progress they are heading towards their best level of play. They have a clear plan about the future of the team, management and coaches have the same thoughts and the same goals so they can realize their plans without any significant obstacles.
During the days of Messi and Ronaldo might not come again till a long time because we had two of them at the same time fighting for the world best and they were also playing in different clubs which are rivals to themselves. Ronaldo in Madrid and Messi in Barca made El Clasico very competitive and Laliga.
We might see good players in future that will beat their records but it we might not see two best players at the same time in two different clubs that are rivals in the same league. No one will forge these two football legends because they have created the latest records that will be hard to break soonest. It is just like you saying that you have forgotten Pele of Brazil
Cristiano Ronaldo and Lionel Messi are living legends of football, their abilities are unquestionable and they are very worthy of being considered as legends in football. They are not only good but they can maintain their consistency in the game, so they can survive for more than a decade in the world of football and even now anything related to them will be a hot topic. Many young players are born and they also have potential. I believe that many good players can break their records and even surpass them in the future, but I don't know when that will happen. One more thing is whether the young players will be able to last as long as them or not, this is actually difficult.