This signing should be the start of a new dynasty for Real, though Ronaldo had a much better supporting cast. From the upcoming generation they have only Camavinga, Vinicius and Courtoius are of a similar calibre to the previous.
You forgot Militao (Brazil International played 5 out of 7 Copa 2021 games, conceded 2nd lowest goals in the league), Alaba (conceded 2nd lowest goals in the league), Valverde (been fantastic a lot longer than Vinicius) and Rodrygo (who has it in him to step up like Vinicius next season) and Mendy (defensively sound, improving in attack).
Once the old guard leaves/can't play as much:
----------------------Courtois
Right Back ---- Militao ---- Alaba ---- Mendy
--------- Valverde --- Camavinga ---- Deep Lying playmaker
-------- Rodrygo ---- Mbappe ----- Vinicius
So basically we need to find the best young RB and DLP within the next 2 seasons (excluding any back-ups).
They can't sign the best players from the PL any more so in one sense it'll be harder for them to get a Modric or a Bale.
When our new stadium is complete in 2024, we can expect an annual net extra cash flow (after annual payments of €30m) of anywhere between €30-150m depending on where you read. That will benefit us.
Its true we can't compete with Big Oil, but neither can Barca/United/Juve/etc. The advantage we have is that any great player that's done playing for an English Oil Club, will rarely join a team in the same league. What are the alternatives? Madrid are more attractive than Barca (finances ... for now), Bayern (league prestige), PSG (league prestige) and Italy (finances, league prestige). Madrid are literally the best choice outside of England's Big Oil. I don't mind free signings at their peak like Rudiger or entering their peak like Mbappe.