It’s quite a strange situation that no FTA network has the rights to Seasons 1-9 of TBBT at present, with Nine only having the rights to Seasons 10 & 11. In fact, last week, TBBT wasn’t shown anywhere on FTA at all here in Australia, which hasn’t happened in years. A bit like the situation with The Simpsons not being on FTA that’s been happening since the beginning of September. However, at least the repeats (from Season 10) return this week.
If Nine had bought back the rights to Seasons 1-9, we would probably have seen those epas scheduled on 9Go! by now, which is currently not the case (again, just Season 10 eps only).
I wonder if Ten, now under CBS ownership, is considering buying the repeat rights to the show for Eleven to fill the void left behind of having lost the Fox output deal? 
I think it would be quite a coup for Ten, therefore boosting Eleven’s audience share, as well as the network share. Perhaps they would air it after finishing with Will & Grace, and air it as double eps each weeknight at 7:30-8:30pm, with encore airings at late night & weekends.