We need 4" Metal Gear toys with in scale Metal Gears.

Adding onto this, I been thinking. I'd probably make two separate scales.
One geared for small dinosaurs, and one geared for large dinosaurs.

The idea is to still make cool posable raptors, troodonts, and other small dinosaurs.
Of course, there would also be the occasional giant dinosaur toy, like a Tyrannosaur that's in scale with the "deluxe" raptors.
There would also be a lot of diorama dressings... tiny nearly-to-non-posable figurines of small to tiny dinosaurs, to be in scale with the normal sized large dinosaurs.

I'd like a Legends of Proffesional Wrestling line of action figures in scale with Mattel's offerings, but not affiliated with WWE or Mattel.

They could feature crimson mask action where when you dip their head in cold water they look like they've been busted open.

Lord of the Rings in 4" scale!

I say take this idea a step further, and make two lines: 4 inch classic television line, and include characters like Al Bundy, the Fonz, The Munsters, Mary Tyler Moore, the cast of Mash, Cheers, Bill Cosby, Seinfeld, The Lone Ranger, etc.

and the follow up would be a classic movie line: Dirty Harry, Scarface, The Godfather, the Magnificent Seven, etc.

I've seen them make Mego-style figures of some of these, but I would love some of those classic characters in 4 inch Joe-style action figure form.

MASH *did* have a 3.3/4" joe styled line.

I would make the Assassin's Creed characters into figures. I know that already happened, but I'd make sure they didn't suck.

Avp in the 4'' scale, or maybe a just a little taller than MU figures.
I'd also make a Demon/Dark souls line. Those games had a lot of cool character models.