Their attendance before this mess started was not out of the ordinary for other basement dwelling teams in such markets. Carolina/Anaheim before their Cup runs. Columbus. The Islanders. The Blackhawks before they were relevant again. The Kings before they were relevant again. The Panthers. They only hit dead last in the 2009 season.
The evidence suggests a strong correlation between attendance woes and the current ownership fiasco. Past precedence with other teams in a similar situation indicates this.
A well known document from the bankruptcy procedures has been floating around here for years that basically shows the 2008 (and prior year) attendance numbers were incredibly sandbagged with free comp tickets and non-paying customers dressed as empty seats. The numbers you quoted were likely "tickets distributed", not "how many people actually showed up", or even "paid tickets". Big, big difference.