[jeremyR] “If I do move on, what NLE will play nicely with my old Media 100 projects (if any)”
More or less only Media 100 i and Media 100 HD and sw. With sw and HD you can open all your legacy timelines and media files and continue working where you left off. Plus, you get all the additional realtime power (realtime moving alpha and chroma keyer, realtime codec mixing, realtime RGB colorcorrection,…) for SD projects and the HD capabilities if you need them. And everything within the great Media 100 Ui which still is the most intuitive and quickest way for editing I know.