For the sake of idle speculation here is my prediction on the future of Lightroom.
Stage 1. Lightroom Classic will go away once they manage to bring across all the classic features into Lightroom CC. The same two packages will remain available, a Lightroom CC one with 1tb of cloud storage and Photographers one with Photoshop and an option to use Lightroom CC with local storage or (for additional cost) cloud storage.
Stage 2. The most crucial (as judged by Adobe) "photographer" features will be ported from Photoshop into Lightroom CC, and the Photography plan will go away. Lightroom CC, will now be available with different levels of cloud storage at a range of prices (including a no cloud storage option at £10/$10 a month). Photoshop will now only be available as a "normal" Adobe CC application at £20/$20 a month and will no longer be bundled with Lightroom. If you want Lightroom and Photoshop you will need the All Apps subscription at £50/$50 a month.
Stage 3. To rationalise pricing structure Lightroom CC will increase to £20/$20 a month to bring it in line with other Adobe single app prices. Photoshop Elements will be promoted/Developed as the low cost "all in one" option for the non enthusiast/amateur photographer. To save development costs this new version of Elements will really be Lightroom CC with "advanced" features de-activated.
As I say, just idle speculation, but I nearly posted this few weeks ago, but in that post Stage 1 was Lightroom stand alone going away, and of course this has just happened.
Cheers,
Graham