Well there isn't really a big problem in drawing for everyone, but the chain has gotten rather messy to the point where people (including myself) have lost track of what is going on, and that makes it hard to join in.
It's not a really big issue, but now that people just break the chain and draw the oc's they want, there is a very good chance that some people participating will get nothing in return because people skip over their characters to draw another more popular character instead. That's why I suggested a chain in the beginning, so everyone can get something out of it.