But but ... D&D is all things to all people
Turning a fighter into a gish at some point --- probably a good idea.
(sticking with my post two back)
I got dragged to the last Harry Potter movie.
Don't ask why ...
There's a big fight going on, with a Whirlwind-type
effect right on top of Harry, Hermione and 3rdwheel.
Hermione grabs their hands and they Teleport away
to a safety spot. 3e can do this no problem.
4e has one EpicD that could do this only at level 30.
And there'd be a debate about whether the Ritual
could be interrupted or not, within nasty combat.
That's a whole giant market of possible D&D-ers
who have no problem at all, with mid level 3e magic.