When you start to realize how relatively litte Wano alone accomplishes from a 400+ chapter storyline (compared to what is left), you realize how moot these claims and comments are about "progress" in the series.
At best, 2 Yonko fall, but they aren't even the most important Yonko, let alone the only factions left. For one thing, the WG, CP-0 and the Marines are relatively huge organizations much bigger than these 2 Yonko, and when combined with the SSG, Revolutionaries, Underworld, and the (literal) hundred major characters that make up all of these factions, you start to understand the impossibility of OP ending anytime soon unless you WANT it to end like Bleach or any other canceled manga.
It physically cannot happen in 5 years without Oda shortchanging many characters, which I personally cant see him doing since he consistently sets up each faction for something bigger or greater than we know.
Let alone the fact that Wano ALONE still has another 1-2 years of resolving itself. Honestly baffling to me people think it can end soon without wasting the last 23 years of progress.