I dunno if he's saying that but it seems reasonable. It seems like every spin of the WC wheel there's 5 serious teams -- call this the Germany Tier. Then there's 5 "meh, who knows, maybe they'll catch a couple breaks" teams -- call this the Argentina Tier. The next tier down is empty -- or I suppose it's permanently occupied solely by England. Then comes the "they might catch a good team napping and get a draw" teams -- the Nigeria Tier. Then comes the Australia "don't forget to take pictures" Tier.
Prior to 2002 we were in the Australia Tier. Since then we've been working slowly up through the Nigeria Tier until it looks like we're near the top of it. It will probably take another 12 years at the same pace just to climb through the England Tier, but that seems to be our most likely future. The good news is this climb is for keeps -- even if we have a really crappy WC one of these times we're not going to tumble back down the ladder; every step seems to be secure.
Also, I think we're going to be making the climb with Mexico, which as was pointed out below will give us something to compare ourselves to, and importantly a reason to keep incrementally improving even if the result is still a Round of 16 exit every time. Playing urine dodgeball with the Mexicans will probably be our big incentive until we finally (together) break into the Argentina Tier sometime around 2028.
(Of course by then the two nations might as well be united as Aztlán anyway...

)
I put the tiers this way:
Tier 1: The Champs and The Dutch
The serious contenders. The Superpowers. They've all won World Cups, except the Dutch, and the Finals will almost certainly be between two of them.
Brazil
Argentina
Spain
France
Italy
Germany
Netherlands
And barely here:
England
Uruguay
Tier 2: The Almost There Tier
Teams from Europe and South America that are just on the cusp of making it big. If it can come together, and they get some luck, they'll win it and move up. But right now, it's a big gap. They might not always be there, but when they are, they usually do well.
Belgium
Switzerland
Colombia
Russia
Portugal
Chile
Sweden
Newest member: Greece
Tier 3: The Best of the Rest
The best non-Euro, non-South American teams. There's not much of a gap between the top of this tier and the bottom of tier 2, if at all. But there is gap between the tops. These guys are almost always there because not many can challenge them in their regions, but while there, they need luck to survive and advance.
USA
Mexico
Japan
S. Korea
Australia
Ghana
Ivory Coast
Nigeria
Cameroon
And the newest members: Costa Rica. Algeria.
Tier 4: Thanks for coming, enjoy the stay, make it tough.
The last team out of CONCACAF
Pretty much anyone from Eastern Europe not named Russia.
The last team out of Asia.
The last team out of Africa.
The real difference between Tier 2 and Tier 3 is geography and infrastructure. They have a better and longer existing infrastructure and geographical advantages that those in Tier 3 will never have. Those advantages allow them much quicker, much higher returns on investment than those in Tier 3. That's why Belgium can go from not qualifying to the Quarters in one cycle. That's why it's not fair to compare us to them. The Tier 2 problem is the overwhelming gap between them and Tier 1.
As for the US, making it to the Round of 16 two World Cups in a row is not a plateau. That's upward movement, we've never done that before. And of the Tier 3's only Mexico and Ghana have done it. Now, if we're at the Mexico stage of getting there but never moving on, you'd have a point. A lot of the World Cup is luck of the draw, especially at Tier 3, if we play Greece we probably advance. Same thing for Mexico. You need a bit of luck, we didn't get much.