So had a thought, and I’ll try to lay it out as succinctly as possible.
The problem with Ele traits is their discrete nature. Fire traits generally only affect Fire skills, Air for Air, etc. Which means most trait points spent in Elemental lines only link to 25% of skills.
Why not go with a more holistic approach? Instead of the current Ele trait design, in the new system traits would modify the basic weapon skills in some way, for example Fire has always been traditionally the “massive AoE” element in this and other fantasy games, so ANet would alter Fire traits to add an AoE damage component to ALL Ele skills. Already AoE damage skills could have their damage doubled and AoE extended (or some number thereof) while skills like Chain Lightning would have an AoE damage component added to each hit. Or casting Windborne Speed would have its current effect, and inflict a PBAoE Burning and/or Torment on foes caught in the AoE. Something like Cleansing Wave would inflict Burning and Blind to enemies caught in the radius.
Then you alter traits in each line along this approach. Water traits might cause Burning Speed to also inflict Chilled on enemies, while Air traits might cause the same skill to inflict Daze or Stun. Earth traits might cause Burning Speed to Knockdown all foes in the Blast radius.
In this way, a majority of Ele traits would then work ALL the time, rather than just in specific attunements, encouraging diverse builds and playstyles. Players who focus in Fire would do considerable damage in all attunements, whereas a player focused in Water would heal allies and Chill foes with every skill.
The traits would then be thematic. A certain Air trait could cause AoE Blind anytime a finisher is used in a Fire field, whereas an Earth trait could add any number of conditions (Immobilized, Crippled, Weakness) when casting Water skills. This would allow ANet to designate Fire as the AoE damage traitline, Air the single target, Water the heal and support, and Earth the heavy CC traitline. Further, if ANet didn’t want to make the majority of traits work with EVERY skill, then they could instead introduce Elemental dependencies, where each traitline would effect two attunements. Fire traits would double Fire skill damage and add AoE damage to Air skills, Air traits would add extra instances of conditions like Vulnerability and Blind to Air skills, or cause status effects like Stun and Daze on Water skills (electrocution), and so on.
I realize a re-design of the system as described above is highly unlikely at this time or any point in the future. But I do believe its the best way to long term fix the Ele’s competitive disadvantage with other professions without introducing the power creep ANet is apparently so afraid of.