I think the whole system could use restructuring.
Cross Country:
5km, 10km, 4x2km, 3km Steeplechase, courses don't need to be certified, just close to the same length. Winners from tour meets get free entry into World Champs. (Same system as Road Racing, see below)
Indoor Track:
60m (all out sprint)
200m (More sustained sprint)
600m (Mix of 800m and 400m athletes)
2000m (Mix of 1500m and 5000m athletes, a very tactical race)
SMR (800-400-200-200)
4x200m (Ideal relay for a 200m track)
Pole Vault, High Jump, Long Jump, Triple Jump Can be done indoors without interference from the wind.
60m Hurdles (all out sprint with hurdles)
Pentathlon as the multi(60m, 600m, High Jump, Long Jump, 60m H)
Outdoor Track:
100m (who's the fastest?)
400m (exciting, sustained sprint)
800m (Quick, tactical race)
1500m (The ideal tactical race)
110m HH (Quick sprint with hurdles)
4x100m (fast paced relay)
Long Jump (Farthest Jump)
Pole Vault (Personal Favorite and a big crowd pleaser)
High Jump (interesting to watch)
Javelin (Ideal throwing implement -> maximize impressiveness)
Shot Put (Least ideal throwing implement -> test of strength)
Road Racing Circuit: (Combined with Marathon Majors)
5km (100 athletes)
10km (100 athletes)
Half and full marathons (200 athletes each)
Qualify for a season based on a performance standard (13:30/28:00/60/2:08 or the like) or by winning a race at a lower tier. Score points based on placement over a season. Additional points awarded for fast times. Bottom half by points without a time standard are relegated out of the circuit.