A guy with the athletic skills and extremely strong wrestling base like Lesnar can. I think Randy Couture was 30 when he started and he became not only a standout, but also evolved skillwise with the sport. I think a guy like Lesnar can make a career out of MMA. I think with his existing skill level, he could even beat some high level competitors. I think more care needs to be directed toward Brock Lesnar's development. He's a big name and draws fans, so they put him in the main card too soon. His pre UFC fame will help him get fights against big fighters, but they wont pay him quarter of a million to slap around non-contenders.
The UFC may not want Lesnar around long. He may be there just to increase fan base. He is a really expensive prospect.