Id Software's current owners aren't really known for locked down rail action games, quite the opposite in fact. However, if you want a modding scene like Doom's, it's not going to happen with any modern AAA game anywhere, no matter what any executives do or don't do. The asset fidelity is way too high, which puts an extremely steep barrier to entry for any modders who want to make a really expansive project. To make a fully-featured expansion pack or TC for a modern AAA game would take many people with professional-grade talents working hours per day. Most people willing to do such a thing join a developer and get paid to do it. That's why you can find literally thousands of swords, suits of armor, boob mods, new houses, gameplay mods, etc. for Skyrim but not really any new full worlds (there's an extremely incomplete remake of Morrowind and um...uh....). It's just too much work.
This is very disappointing now. If anything was well describing the id games, is that they were fun, well-balanced, monosyllabic, open-source shooters. I fear that now we'll start seeing story-driven, easy, "Realm of Location"-style named locked-down rail action games.
I really want id to reincarnate, though. There must be a simple-named company producing simple-named shooters for the people.
And if you do make a 2.5D or '90s style 3D action game with mod support, you have to compete against the ones that already exist and everyone already knows how to make mods for. What is more likely, someone making a mod for a Doom clone with a completely new engine, or someone making a mod for Doom?