Becuase companies such as Prometheus Systema and Guarder will make parts for these since they usually do once a new AEG comes out. In time it shall be made.
No, they make parts for guns from Airsoft companies worth a crap that the mass market will buy. It would be completely stupid to make custom aftermarket parts for a New product, from a new company with 0 reputation behind it. They would have no reason to dump money into R&D on a product that has no background.
IF it does well (and that is a big if) then we MAY see parts from some of the above companies but it will still be limited amounts due to the simple law of Supply & Demand. Proprietary parts for an Unknown Product/Company means demand will be low. Even if the product does good (which is highly questionable) they are still parts specially made for a small player in the market. It simply isn't good business sense.
Examples:
1) Version 5 gearbox. Only one gun (Uzi) uses this and a not so popular gun at that uses it. Result, despite being made by the original major player called Tokyo Marui? Go try to find upgrades parts for it. Good luck.
2) ICS M4's. Up until the current models they had different gears meaning if you replaced the motor, you had to replace gears or vise versa. Do you see any of the companies making Gears/Motors compatible with the original ICS parts? ICS has way more demand and rep then Real Sword. Second it the gearbox itself. Do you see anybody making aftermarket casings for ICS M4's?
3) AEP's. How long has it taken to start seeing a decent line of AEP upgrade parts? Even now selection is limited on both internal and external parts (IE Metal slides).