more issues if it will come back:
1. it starting to get old, the renders are not of today's standard
2. to resume work after this long time is hard, most of the time, devs will feel more comfortable with a remake or a new game
3. to restart/resume is very hard, a project needs its momentum, when that is broken, it will be another obstacle to overcome.
how often a dev that stopped for this long time did succeed to return?
almost none. the few that did, worked a bit and disappeared again or they keep remaking it and changing it and is not going anywhere with the game.
this game is dead. only a modder with motivation could continue the work.
but how likely it will feel and be the same quality as the original? most mods fails since they have their own idea and execution so it will feel unfamiliar and most of the time feel its just a bad copy.
unfortunately, since I really liked this game, one of my favorite.