I would likely upgrade if only to capitalize on my existing lightwave knowledge, but if and only if this hypothetical lw 2021 actually is an upgrade, because that would be proof of life, not just a new number and a recompile with some bug fixes. I don't see that as very likely however. I think its been shelved for good, even if they may still sell it for a while.
It is a real shame, because I felt like the team had been on a great path with the types of improvements they were making, lots of under the radar but good stuff, primarily usability improvements, I know people swear by 2015, but lw2019 was SOO much better from a usability standpoint. I haven't yet upgraded to 2020, but I had planned to before the wheels finally came off the lightwave bus.
Now, though, even if they do somehow get the thing up and running again what would the direction be? are the people responsible for the most recent improvements even AT Newtek anymore in any capacity?