look around the technical and series discussion, you will be amazed , many members who joined recently are top notch geeks.
If that's true, then they shouldn't have a problem advancing in rank if that's important to them. But if you think it's not the low-ranked members who are the primary problem, obviously you haven't ready many threads in Altcoin/Bitcoin Discussion. Not to mention the rest of the altcoin section, the ANN, bounties, and tokens parts in particular. The shitposting noobs have also started to infest Economics, Trading Discussion, and Speculation as well. Go read some threads in all those sections and then tell me if you disagree with me 100%.
These members with low ranks along with many others have many great posts. the reason you see the low-ranked members as the source of problem is probably mainly because of the number of the low-ranked compared to the high-ranked.
for every good newbie there are probably 10 shitposters newbies posting in the same topic, it's mainly a matter of low-rank to high-rank ratio that gives this perspective.
everyone was a newbie at once, and i believe they all should have the same chances like those previews newbies who now ranked up.