Not everything - the credit crunch, the FFP rules, the EPPP, etc are all things that have an impact on the club both now and in the short to medium term future.
I completely agree, sisu should have either bought 50% of ACL or renegotiated the lease back in 2007, or better still why not let the club go into admin and buy it then? But that doesn't alter the fact that the rent was unsustainable and unfair, and the club get no benefit (yes they sold the rights) from match day income. All in all ACL have been in receipt of circa £2.5-3m per annum from the club for what is essentially 23 days use a year (£1.3m, £230k match fees, £1m income from F&B's plus stand naming rights, car parking, etc).