I would like to see a reissue of the MPC 32'/33' Chevy roadster. I wouldn't mind the van/paddy wagon version either but they would have to retool the body. The origenal was modified for The Dark Shadows vampire van.
The MPC Ford Woody/street rod, last released as an AMT kit, would make a great reissue.
The Corvair powered Meyer's Toad would go along with the other dune buggies AMT has recently reissued.
There's the MPC 68' Jeepster convertable if the tooling still exists..
AMT made a 68' AMC Jevlin and a 69' AMX kit but I'm not sure if those were rebranded Johan kits.
I'm sure I can think of something else.