They may be gone, but I do think they'll be leaving Wrexham in a much better state than when they found them.
So no, I don't think they'll have to "start again"
If you watched Welcome to Wrexham, this video from Tifo IRL gives some essential background:
They speak to Humphrey Ker, Executive Director of Wrexham and the one that got Rob into football. You'll recognize him from the show.
Haven't finished the series yet, I have a few more episodes on my DVR to go, but I really appreciate their "warts and all" approach. They've not been afraid to include harsh criticism from the fans, for example. Like in the episode where R&R first visit Wrexham and they are in the pub and one...
Seen the first couple of episodes. Liking it so far. Not sure if it'll be as good as Sunderland 'til I Die, but definitely miles better than the hagiographic All or Nothing bullshit.