Originally it was cited that cost concerns were the reason for decreasing displacement in Dakar, and it seems understandable. A multitude of manufacturers made 450's of some sort, and with the move to tighter trails and roads this size of bike has ultimately proved successful. However, in the interest of improving competition and interest I think its time to bring big bikes back in a separate class. Never before have there been so many dirt worthy machines of large displacement. A production based class full of AT's, 1090 adventures (or 790's!), BMW f800's, Triumph Tiger's, and T700's would be exceptionally more relevant to the typical rider that follows these races. Not to mention, if production rules were implemented (stock frame, engine cases, and suspension tubes/shock bodies like AMA pro mx) this would be a huge driver for driving the off road capabilities of large adv bikes that are monsters both on and off road without breaking the bank. Obviously, the fastest pro's would still be on their 450 rally weapons, but as a support class, why not?