He hasn't been busting his hump for it for very long though, and he is young enough to change direction. Many people much older than him who have spent many years training for and doing a job they liked have had to change direction when outside forces made their jobs redundant, etc.
The main problem I see for Harry is that he is not academically inclined; everything I think of for him to do now involves university. Apart, that is, from the fleeting thought that he could go to South Africa and lead wildlife safaris or mine diamonds. He also has charity interests in Africa which would probably benefit from his hands-on assistance. Considering his close attachment to Chelsy, such a move might not be as fanciful as it might first seem.