IMO no.
Too many downsides (speaking in terms of pure gaming performance) compared to AEGs. GBBRs will probably become much more widespread, but it won't go far enough to replace AEGs...

For Milsim maybe, but for Skirmish use, You will never be able to build a GBB more practical then an AEG IMO

Fingers crossed.

However, it will make the entire world smell like cabbage.

If the cabbages you eat smell like propane....
Chances are you already are going to die soon.

Nah, if you ever have old cabbage in the fridge.

"Hey, whos been shooting my Hi Capa?!"

"No, thats just the fridge"

yah but the tank that actually holds the gas is still metal therefor your heat capacity theory doesn't really work... a mag with a metal shell and metal tank wouldn't differ much from a plastic mag with metal tank. the reason the KJW has better cool-down rates is because since the mag is bigger the tank can be bigger too. plus thermolds don't fit in those open top pouches especially the double mag pouches because of the large ribs on the sides. anyone taken the mags apart yet? maybe a pmag/stanag conversion? dimensions look fairly similar....
scroll down about 3/5ths of the way to see comparison pics between pmag and thermold

Metal has a better heat-conductivity than plastic... so it will absorb or dissipate energy a lot faster than plastic. This is why it becomes cold to the touch.

The actual temperature change happens because of a pressure difference inside the tank, so your tank could be metal, ceramic, plastic, whatever, it won't change anything in the temperature change, metal will just absorb it faster...

but keep in mind the contact of the metal is plastic, and when heat draws away, heat from the plastic will be draw. if its metal, it has lil heat, which cause it to cool down rapidly.

Wrong.

Care to explain?

And are you saying my opinion's about milsim? or skirmish's are wrong?

How do you know? From all accounts you sit in your apartment hugging your precious and never game it.

meh, a few guys on JOC have taken original WE mags (ie metal tank+metal shell) and converted them to pmags (metal tank+plastic shell) and reported no change on cooldown/efficiency and change in relation between external temp and fps. i think any difference can be attributed to KJWs internals/gas system more than any other factor.

For everyone that is concerned about the FPS being so high with this gun using Propane, I found something on youtube that is supposed to reduce the FPS output of the KJW M4.

YouTube- Cradle Airsoft O-Ring Piston and Velocity Adjuster Installation for KJW M4