I for one, have no problem seeing a retelling of characters I cared about from TOS being brought back and reexamined on the big screen with a big budget.
As said elsewhere, Superman has his Lex, Batman has his Joker, and Kirk has his Khan! AP calls Khan the greatest SciFi villian of all time and Khan was ranked 10 th greatest screen villian of all time. So its a no brainer to bring Khan back and explore him further.
It has been said that Khan is the mirror image of Kirk and Wrath of Khan is called the best of all the ST movies. IMO nobody really cares for the more cerebral thinking ST villian (like Vger) in ST TMP even if they claim they do.
Each time the story can be told better I think! For example, Kirk hasn't even stranded Khan on Ceti Alpha V. Theres new reasons for Khan to plot against mankind.
I'm sure JJ Abrams won't let us down. He realizes the fate of the ST Franchise rests in his hands. He's a fan and he's not a stupid man. Have faith.