A lot of people (especially RPers) think that because the sunwell is restored and now is a fountain of mostly holy energy, their addiction is cured. But in fact its like giving a crack addict a life time supply of !@#$. Its not the same thing, but it sates their symptoms and cravings.
Thats my view on it. Anyone willing to discuss?
Elves - all elves - are to some extent dependent upon Arcane Magic, because they emerged as a race through the influence of the original Well of Eternity. They are innately magical beings.
Note that Night Elves, for all their claims to the contrary, still revere the Well of Eternity and use its waters to bless their Moonwells. Satyrs use a fel-corrupted variety of Moonwell in the same manner.
The Sunwell was simple the Quel'dorei version of this, in a sort of "all your eggs in one basket" fashion. It was created with water from the Well of Eternity, and further empowered by the ley energies that made Quel'Thalas an attractive spot in which to settle.
While the Night Elves do curtail their use of Arcane Magic (without being free from a certain degree of dependence), High Elves did not. They simply hid their magical activity with rune stones to prevent attracting the attention of the Burning Legion, and this strategy was successful.
The Sunwell was destroyed, their addiction became accute, and those most subsceptible became the Wretched. High Magister Rommath returned from Outland with a solution - tapping fel energies from demon-imbued crystals.
But this did not turn Blood Elves into Fel Elves in the way drinking demon blood would for Kael'thas' followers in Outland. It simply made them more vain, ruthless, hedonistic and vengeful - heightening vices they already possessed.
The restoration of the Sunwell did not free the Blood Elves from Arcane addiction. It merely restored a reliable source, and balanced the felfire crystal influece with Holy Light. It did not restore Blood Elves to High Elves - their eyes are still green, etc.
Nor did Blood Elf society give up Fel magic. A Warlock sanctum still exists in Murder Row. Felfire Crystals can be found in every area of Silvermoon except Farstrider Square. Felfire Crystals can be found throughout Eversong Woods as well.
It is debatable whether all Blood Elves are Fel-addicted, although some undoubtedly are. All remain dependent upon Arcane energies, but there are now more sources upon which to draw.