Sorry if this is off topic, but I think the bold sentence needs to be addressed, because promotion isn't the only way Southend United can become sustainable. Although it's absolutely right that there would be an increase in television revenue, as well as Premier League solidarity payments, Academy funding and prize money in the EFL, costs would also rise for player salaries, transfer fees, signing-on fees, agent fees for example, and therefore it's not the panacea to financial problems, although it would absolutely be of assistance.
It's often said that clubs should speculate to accumulate. In football, speculation simply leads to further speculation. Once the club was in League Two, the clamour would soon be to get back to League One, because there are bigger clubs in that division and therefore more away fans, and we've played there reasonably recently. Then it would be that we should speculate to get into the Championship, because we've played in the second tier before. Then, after a while, it would be: why can't we reach the Premier League, because if AFC Bournemouth/Brighton & Hove Albion/Fulham can play at level, and before them Luton Town/Swansea City, and we've competed at a similar level to them recently, so why can't we do the same?
COSU have made some incremental improvements in the ten months they've had custody of the club; getting more of the ground open to increase capacity, improving the food and drink provision, opening up areas of the ground on a non-matchday (e.g. big screens for the play-offs, St Patrick's Day), and potentially something like the membership scheme advertised at Wembley.
But the club is losing £2m+ a year, and promotion to the EFL won't solve that (we were losing a comparable amount when we were last in the EFL, albeit under the previous owner). That's why COSU are looking at ground redevelopment, especially in relation to the East Stand, to bring in money 365 days a year, rather than just on the limited number of matchdays we have each season; that's what they've identified as the real route to sustainability for Southend United.