Jair, ok, of course that a winning team will get the boost, but you are exaggerating.
Croatia is in the final.
99% of people here won't be able to say names of more than 2 clubs from Croatia (Dinamo Zagreb and ???).
And probably no one knows a single player currently playing in Croatia.
If Croatia will win it, a few Nt players will boost their prices and a few young players will be sold on that wave of hype and in the future, clubs will have an eye on more Croatian players.
Other than that, still no one will know more than 2 Croatian clubs or will ever watch a single match from a Croatian league.
* Guys from Slovenia, Bosnia, Serbia, you don't count.
You will be able to name 3-4 clubs and 2-3 players from your country playing in Croatia.
Others?
If France will win it, ok, their league will get some boost and more publicity, but...
So, Jair, you are exaggerating.