You don't know what you've got 'til it's gone.
Cherish whatever time we have left and enjoy watching the three greatest tennis players ever (male or female), because it will be a very dark day when this trio steps away.
In fact, I can see attendance figures at all events plummeting and general interest in the sport doing the same when they're gone.
I'm a huge Nadal fan, and while it used to eat me up when he lost in the past, I am not all that concerned about Sunday as I am just grateful that I still get to watch him play.
Don't get me wrong, I love seeing these guys playing at the top of their game well into their 30s but I feel like it would be healthier for the sport if one of the teens/early 20s guys (especially those with tons of marketability like Shapovalov or Tsitsipas) break through and win a major or two. It's still too one sided, these semifinal blowouts aren't good for the game IMO.
Think about it, what was the biggest story of this Australian Open besides arguably the Serena upset? It was Tsitsipas beating Federer. Upsets grab attention, young rising stars grab attention and add some legit competition and storylines going forward. Right now, Nadal and Djokovic are still well ahead of the rest of the field at full health and while I get what you're saying in regards to cherishing these guys while we have them, I'd also like to see some breakthroughs to spice things up.
With that said, I'll be up first thing in the morning with my eyes glued to Djokovic/Nadal. There's always so much hype about the Federer/Nadal rivalry because of that one Wimbledon classic and with them being the two most popular figures in Men's Tennis history but for my money, Djokovic/Nadal is the best rivalry on the court in the modern era.