S397 several years ago said that things like hybrid will come when they license cars that use it.
From a modding and player perspective, that's disappointing as an approach.
But if we're talking about the future of rF2, or at least the ongoing viability of it, it doesn't seem completely illogical. If they spent the time right now to bring across the hybrid system from LMU (ie proper hybrid, not the BTCC version), the only direct benefit is to players and modders who sell their cars, because without a licensed car relying on it you can't attribute any protected sales to the feature (you could suppose particular third party cars/genres will drive some extra sales, but I don't know how strong a case that is for planning meetings).
Taking a step back, rF2 has had 3 goes at this: the ISI model with relatively few real cars, S397 doing some more licensing, MSG pumping money into bigger series and features like race control. At all times it's been 80% of what it needs to be as a game, with various issues and shortcomings stubbornly dragging it down (and, with social media how it is, an easy target for ridicule).
Many of us have had criticisms, and a lot of that is justified, but if it were easy to manage ongoing profitability and bug fixing / feature adding, they would have done it. It's our leisure but it's their livelihood - it's not like they have any reason to not do their best.
I'd love rF2 to at least run in a trouble-free and user friendly manner, and some extra features (and content) would be great, but working towards that - in the real world - has been ongoing for 12 years and hasn't seen success. Even if its troubles halved (or better) overnight, many people would shy away purely by reputation.
LMU and other similar projects might not be what many rF2 users want, but it might be what S397 needs. It's a lot like buying DLC, it's just got its own custom UI

(and features, I hasten to add, lest the "rF2 mod" cries ring out)
And there are people getting LMU (who are interested in that content! Perhaps largely from locations where the "Le Mans" movie wasn't renamed to "Ford vs Ferrari", but others as well) who have then decided to try rF2 for the first time. So there is some trickle-down benefit already.
I really do hope some more bugs get fixed on both sides, though. For me it's much too early to forecast LMU's demise, but patience isn't infinite.