Though maybe I should ask how likely you think it is that this team will go right back up.
Given the fact that you can have a lot higher wage bill, I'd say very likely. That $5 mill will just fund the promotion via a anti-bankruptcy fund. Genuine D2 teams can't compete on salary wise as they can't afford to make losses every week. Whereas this D1 tanker can afford to make losses week in week out in D2 because of the extra cash he has. That means ,this team can afford to have a salary bill of a lot higher then what a genuine D2 team can have.
Not to mention this team becomes the envy of all. Being able to gain D1 revenue whilst running close to no team at all. Needless to say, the D2 teams get very frustrated because this tanker hogs a spot in the top league while there are D2 teams that can easily roll over this D1 team if they play a match together.