One of the fics I've always wanted, DESPERATELY, in this fandom where exactly this happens, because if it did?
@themardia (my expert in all things English Premier League) has described to me what exactly would go down*, and it's kind of horrific — because what Rebecca did was not only grossly wrong and unethical, but was actually illegal. As in, girl could (probably won't, but could!) go to jail for trying to sabotage her own team.
At minimum — at BARE MINIMUM — she would be forced to sell the club and would be banned, probably for life, from ever owning another English football team. Other leagues would follow suit, because FIFA will tolerate a lot of shit but they won't tolerate someone trying to decrease the value of their leagues. She would also get sued to kingdom come by the other EPL owners (Rupert would be especially delighted by this) and lose... pretty much everything she has. She's not rich enough to protect herself from the truly rich owners who comprise the majority of the Premier League.
The club would go up for auction, basically — Rupert couldn't buy it, unless he sold West Ham in a hurry, but Edwin (or hell, Jack) probably could, assuming that its price is merely ludicrous instead of absolutely disgusting the way most EPL clubs are.
And whoever came in would look at Ted as being an agent of Rebecca's schemes — he might even be found complicit, since Rebecca told him the truth right before they got relegated. How could he prove he didn't know before then? Rebecca would try to save him, of course, but at the very least Ted would also be out on his ear, along with Beard and Roy (and it's possible they'd go after Nate, even though he's no longer at the club — there'd probably even be some vile garbage about how the only reason he got promoted was to keep the team relegated, or something. And Rupert wouldn't lift a finger to help him, I don't think). Higgins would also, of course, be out on his ear — if anything, he'd be the most likely to suffer real consequences, because a) he's not a rich and powerful person and b) I fully believe he would try to shoulder more guilt than he actually deserves for what he did. Rebecca would, again, try to save him, but what if she can't?
Some of the players would stay, depending on their contracts, but can you imagine the hit to morale if they found out their boss had sabotaged them to the extent of getting them relegated, and that their coach not only knew but never told them? I think most of the team who could leave, would leave. Which would destroy the Total Football gameplay — would destroy the very fabric of the club. No manager coming in could control the damage that would do; they'd likely get relegated the following year. Such a catastrophe tends to snowball, and Richmond might well falter the following year, too — going down to League One, something that rarely happens but considering this kind of earthquake wouldn't be impossible.
And what would that do to the fanbase? Mae's pub would probably go out of business, its status as a Richmond Pub now considered bad luck; hundreds of people who relied on Richmond's status in the Champion and Premier Leagues would lose their jobs. It would be a disaster for every single person who had anything to do with the club.
And so to imagine Trent writing that, knowing what would happen, but writing it because it was the truth and because it was wrong — and then seeing all the fallout from that? WHEW THAT WOULD BE QUITE THE STORY.
*what she described is not, of course, what I've written here, because my brain is a sieve, but I think I got the gist of it