I think this kind of dynasty can only happen under several factors: relegation, having an well-established tier 2 and (maybe) tier 3 is very important for a real threat to tier 1 players.
A well-structured Valorant scene would result in a group of people (5 players + coaching staff) dominating the game and studying it at an academic level, just like Astralis did when they won four CS:GO Majors. On top of that, having a team of psychologists and orgs providing better quality of life for players—such as housing, a manager to handle off-game issues, and the presence of family, friends, and a partner in their lives—would make a huge difference.