I'd actually prefer same servers. FFXI's servers are very thriving due to everyone(both console/PC and English/Japanese/European) on the same servers. If everyone is divided up, the player base seems smaller in general. Console players would complain that the game is empty when in fact the PC servers are thriving; they just don't realize.
Sure you get more immature brats on consoles(especially 360), but those kids will be bored of LotRO and leave in a few weeks, same as they did on the PC version. The game would quickly revert back to the mature player base after a few week period of the kids trying it out.