Luckily the Blender org is really good with keeping old stable versions around, so as long as your OS doesn't make it too hard to run them, you can use any Blender version you like. It will be possible to work on more projects using BGE or the old internal renderer for long time to come.
Now, as I understand it, Eevee is and will be only concerned with rendering at real-time or near real-time speeds. It's also the major reason they're upping the minimum OpenGL version requirements to 3.3 in the new branch.
They haven't forgotten about interactivity though. A recent message from a mailing list outlined plans for the future. They are giving a grant to someone to work on particular features part time.
Summing it up, they want to implement an interactive mode that makes working with simulations and baking them into animations "pleasant & usable." They are also inviting game engine developers to work with them on Blender compability and integration. (This is something that open source engine creators might particularly like. It's not like they have the resource to create their own equivalent of Unreal Editor.)
Source:
https://lists.blender.org/pipermail/bf-committers/2018-May/049438.html
I'd say that's enough Blender talk for now. I find that checking the recent Youtube videos on Blender now and then is enough for me to keep up to date on the latest developments.