Three things are lacking in CoH: 1) content for solo players 2) new starting/ low level missions and zones (picking a new costume and powers is fun, but then you get stuck doing the same missions over and over) and 3) a wide enough range of powers.

I was hoping with Marvel and DC both going to be putting out games, there would be some major upgrades to COH. I'm hoping that now that at least the Marvel game is dead, the developers at COH don't get lazy.
 
One thing that would be awesome, would be if a single character could have more than two power sets. You could do this as a three year veteran reward--but then it won't really be a draw for new people. You could set up special servers with these characters, instead of making it a game-wide change. That way, the people who think these toons are too powerful can just avoid the new servers. Anyway, here are the six power pools:
 
Power Pool One: 1. Archery 2. Assault Rifle 3. Dark Blast 4. Electrical Blast 5. Energy Blast 6. Fire Blast 7. Ice Blast 8. Lasso Attack 9. Psychic Blast 10. Radiation Blast 11. Sonic Blast 12. Thrown Weapons (knives, boomeranges, etc.) 13. Water Blast  14. Web Blast 15. Wind Blast
 
Power Pool Two: 1. Dark Manipulation 2. Devices 3. Earth Manipulation 4. Electricity Manipulation 5. Energy Manipulation 6. Fire Manipulation 7. Gravity Manipulation 8. Ice Manipulation 9. Lasso Assault 10. Plant Manipulation 11. Water Manipulation 12. Web Manipulation 13. Wind Manipulation
 
Power Pool Three: 1. Animal Control 2. Earth Control 3. Fire Control 4. Gravity Control 5. Ice Control 6. Illusion Control 7. Mercenary Control 8. Mind Control 9. Necromancy Control 10. Ninja Control 11. Plant Control 12. Robot Control 13. Thug Control 14. Water Control 15. Wind Control
 
Power Pool Four: 1. Cold Domination 2. Dark Miasma 3. Empathy 4. Force Field 5. Kinetics
6. Poison 7. Radiation Emission 8. Sonic Resonance 9. Storm Summoning 10. Thermal Radiation 11. Traps 12. Trick Arrow
 
Power Pool Five: 1. Battle Axe 2. Broad Sword 3. Claws 4. Dark Melee 5. Dual Wield 6. Electrical Melee 7. Energy Melee 8. Fiery Melee 9. Ice Melee 10. Katana or Ninja Blade 11. Martial Arts
12. Spines 13. Stone Melee 14. Super Strength 15. War Mace
 
Power Pool Six: 1. Dark Armor 2. Electrical Armor 3. Energy Aura 4. Fiery Aura 5. Growth
6. Ice Armor 7. Invulnerability 8. Ninjitsu 9. Plant Armor 10. Regeneration 11. Shield Defense 12. Shrinking 13. Spider Defenses 14. Stone Armor  15. Super Reflexes 

They need some tweaking, but you get the idea.