This is good thinking and a huge step up in mentality. Although PSG have always wanted the champions league title for a long time but now they have it and are not relenting and want more. It is also impressive to see the club investing in player signings for the future, imagine 18 years old Quentin two years later could be one of the most talked about young talents and would be a good asset to the club.
Another thing is that PSG has got the financial capability so this is a very valid investment and it is one which they can afford so seeing them going for it makes a lot of sense. The fact that PSG continues to maintain the burning desire of wanting more is really impressive and I hope they get the more they are pushing for as they are obviously putting in the work to getting it done in their current moves. A second champions league trophy should be their target now I guess.
Winning the championship again won't be easy; every team in the Champions League has the potential. We know PSG performed incredibly well last season, but repeating that feat won't be easy.
I don't think they'll have any trouble winning the French League. PSG is the strongest team there, and it's nearly impossible for other teams to catch up. What they need to do is develop a system that can continue to play the same quality of football in the coming years and bring in young and talented players

I think the same can be said about the French Cup; it is unlikely that they will have any problems with it. The only thing left to guess and speculate about is the Champions League, but as you already said, repeating the feat twice is no easy task. Nevertheless, it is possible. Real Madrid achieved it, and PSG proved last season that they are in top form, which is in fact no worse than Real Madrid at its best.
Nothing is impossible in football, and I believe that If PSG are really desperate to defend the title, they can win it back-to-back. Personally, I don't think that's possible for them to achieve next season, because the king of UCL will be back in form and the trophy will be their most focused trophy next season. Real Madrid has been winning UCL in and out since the past four season.
This is a very premature statement, as it is currently unclear how Real Madrid will perform next season, especially in the Champions League. I wouldn't be surprised if they are not in the best shape, in which case PSG has every chance in the Champions League. But we must remember that it's not just PSG and Real Madrid that exist; there are many other strong teams that are capable of winning.
With the way that the transfer market is buzzing with each team trying to strengthen their squad depth next season champions League will be more tougher so we should not only narrow it down to PSG and Madrid only because other teams in the champions League are also doing great as they have their plans concerning the champions League it's true that that madrid and PSG stands favorite but they doesn't guarantee them the champions League title
Everyone sees Real Madrid as the favorite, but we saw last year that Real Madrid can be a surprise winner in some matches. They performed similarly in the World Cup, suffering a heavy defeat. Therefore, it's inappropriate to single out Real Madrid and Paris Saint-Germain as the favorite. Moreover, even in Spain, Real Madrid isn't the only favorite right now, as Barcelona is in a better position than them, and in fact, Real Madrid is the second favorite. This year, teams like Barcelona, Manchester City, Real Madrid, Paris Saint-Germain, Liverpool, Arsenal, and Chelsea will be among the top contenders in the Champions League and the most serious contenders for the trophy. Of course, we shouldn't forget Bayern Munich and Juventus.