Nitrocar

I didnt know that some of them already use the aeg system. The flywheel is new and only since the rival series right? Do you think this is the best way or are there another ways that are better for improving accuracy and power. What do you think the future holds for awesome nerf guns?

I know I may sound like an idiot to a well informed expert or modder. Sorry. Most of my knowledge is not invested into nerf guns xD

The stampede, vulcan, speedswarm, powerbelle, and swarmfire all use the AEG system. The Cons you're missing are that it's just as expensive and complicated as a premium flywheel and a premium springer combined.
 
With current top-tier flywheel builds (brushless big wheel, daybreak wheels, eclipse, multistage, etc.) you're looking at a FPS of 150-220ish and beyond (multistage brushless I've heard has hit 300+, but that's an insane build). Most users don't need more than 200 FPS in the current meta, and 150 fits most superstock players just fine.
 
Finally, pneumatic builds are easier and no more expensive than an AEG. Airsoft makes them work because flywheels wouldn't work well on the tiny pellets making gas power the best/only option, and because they have such low mass (1/6-1/8th that of a typical nerf dart). They don't take as much power or as massive motors, plungers, and springs.