Here's something relevant that I said some time ago:

Just thought about it, if any of you are wondering why Jundroo can’t add mods like Tank Tracks or Underwater Camera to SimplePlanes, it’s because they’re made by a third party and if the mods get added into the base game, these mod makers, or the legal authorities, will most likely sue Jundroo.
The sole exception is WNP78, who I think got personally hired by Jundroo. As a result, the mods that he made, such as Fine Tuner, Overload and DesignerSuite (the blueprint function), are now in the base game.

@TheFlightGuySP no, you're right. Jundroo's gonna have to hire modders to be devs if they want what they (modders) made to be added to the game's code.
It's very much stealing someone's work if they add mods that were made by someone else who isn't part of the team to the game. Regardless if they consent to it or not due to legality and stuff.
OR if they sell the idea to Jundroo/Suggest and Andrew/the devs give the green light, then they can add it to the base game without problems cause it's their property and concern now.

@TheFlightGuySP There Was Another Problem, For Devs If Want Too Add An New Part For The Game. They Need A Lot Of Money, And They Need A Lot Of Time To Wait To Make Big Money

It's important to consider the fact that while yes, certain mods/mod features were implemented into SP, those mods and features were made by WNP78 (and maybe some other game devs), and later implemented by them when they joined Jundroo.
It's different for non-developer mods. They're third-party addons, and adding them to the stock game could cause legal issues for Jundroo. (Credits to RepublicOfCursedPlanes for a better explanation of this.)

TLDR: No. Unless the mods are made by game developers, the chances of that happening are almost zero.

This is just my view on the topic however. It's possible I may not have all the facts. If someone more knowledgeable than me happens to see this, feel free to correct anything I might be wrong about.