I am not dismissing Rafa's victory
Yes, you are.
I think it is absolutely incredible, but it was expected and will be expected next year. It was his 12th RG...
If Djoker wins Wimbledon, it will be bigger, as it will be his 5th Wimbledon (more prestigious than RG)
How? Nadal became the ONLY player in the history of the Open Era to win the same Grand Slam 12 times, surpassing Margarter Courts' 11 titles at the AO.
Djokovic winning a 5th Wimbledon title, while undoubdtedly important, has already been done before. So you are basically saying that achieving something that has never been done before is less relevant than achieving something that has already been done before.
Plus, with regard to your claim that Wimbledon is more prestigious than Roland-Garros.
Wimbledon in NOT the most important Grand Slam. Here's why:
1) Are all Grand Slams equally prestigious?
No. All Grand Slams are not equally prestigious. Wimbledon is the most well-known worldwide Grand Slam and so the most prestigious.
2) Is prestige (or popularity) a synonym with importance?
No. Prestige (or popularity) is given by TV audience and social network followers, while importance is given by ATP points. Wimbledon is the most prestigious tournament because it is the Grand Slam with more TV audience and more social network followers. But Wimbledon is not the most important Grand Slam, all Grand Slams value 2000 points and so all are equally important.
3) Is there a correlation between the longevity of a tournament and its prestige?
No. There is no correlation between the longevity of a tournament and its prestige. For example, the Monte-Carlo Masters 1000 was first held back in 1897. The Australian Open was founded in 1905 and the Indian Wells Masters was first held in 1974. Yet, no one would say that the Monte-Carlo Masters is more prestigious than the Australian Open or Indian Wells. So the reason why Wimbledon is the most prestigious Grand Slam cannot be its longevity. One could argue that Wimbledon is different than Monte-Carlo, but that would be double standard logic. Either all tournaments which are older are more prestigious than the newer ones, or there is no correlation between longevity and prestige.