Frontier did say that there would only be minor updates in 2019 and 2020 until the release of The New Era at the end of 2020. (I wouldn't be surprised if TNE is delayed beyond that though.) DBOBE claims to have a 10-year development plan, including atmospheric flight and landings, procedurally-generated cities, multi-player capital ships, walking around ship and station interiors and planetary surfaces, on-foot player interaction and combat and other activities, and ship boarding. I see no reason to disbelieve him.
I don't know. I remember an interview in The One (Amiga) with David Braben that I may have taken rather too much at his word about being able to do absolutely everything (being of a tender age, just able to vote etc) that the reality of that game fell rather short, so much as I dig the chap and enjoy his excited handwaving, I take him with a pinch of salt nowadays. (Also dug up this one, and this (p44,45) about ED's grandfather's bugs...). I'm sure he wants to do all those things, but they may continue to elude his grasp.