TBH, I thought we were in the Voyager forum when I first read this thread and posted.
Another episode that I felt had a lot of untapped potential was Voyager Season 6's "Ashes to Ashes" Instead of Lindsey Ballard, it would have been amazing if instead we got the Harry Kim that got blown out into space in "Deadlock". A lot of great potential there. Especially if they killed off Harry Kim and replaced him with his resurrected alien self for the rest of the series.
It would have been interesting to see the crew interact and deal with this new Harry Kim. I'm sure he would have had some mixed feelings being essentially forgotten and replaced with an exact copy for 4 years. Then you have the crew's point of view, where they are mourning the loss of their friend while at the same time processing the fact that he is still he in some form.
Instead we got an interesting concept with a crewmember we had never seen or heard from before who conveniently decides to return to her adopted people at the end of the episode. A couple crewmembers died throughout the years who could have been an interesting choice to bring back.
Lon Suder.
Seska.
Klingon Torres.
Ensign Jetal.
Kes.
However, as with most Voyager episodes, all is set to the status quo at the end with no real repercussions or consequences for the crew