The trails still looked like they're under construction. The ROW is fenced off at all of the old crossings. I was out there visiting a friend - her father is on the Sound Beach community board and is pretty aware of its progress.
I would highly doubt that this line would ever get reactivated. Even at the time it was scaled back to Port Jeff in 1939, patronage was already pretty abysmal. It was apparently mostly hoped that the line would serve the potato farms with freight pickups (just as the Greenport line was doing at the time). There was even talk of extending the line even further beyond Wading River and making it rejoin the Greenport at around Calverton. I'd imagine this was mostly to help consolidate the potato shipments without mucking up the Port Jeff line's availability. The PJ at the time was almost completely single tracked, don't forget.
Looking at the intact ROW now, I can't possibly imagine it ever seeing a train ever again. My friend and I both remarked on how close countless residences are to it, and apparently many NIMBYs are already barking about a biking and hiking trail! So, imagine the first loco that rumbles through. I also noticed a series of crossings that looked pretty hazardous given the buildup of trees or manmade structures in tight spots. Echo Avenue looked especially scary!
When I was living in Suffolk (I dated a girl in the area in the early 00's) and were in and around the ROW all the time, I'd often wondered what would have happened had the line survived into the post-war "commuter" era, and what effect it'd have had on the areas it served. Would they have grown the same way as some other Suffolk towns? Would a Port Jeff to Wading River scoot still work if, say, the PJ was fully electrified and it followed the Ronkonkoma to Greenport model? We may never know.