Sarah Jane Smith morbid thought

I was thinking about how Sarah Jane Adventures caused Big Finish's Sarah Jane Smith series to end abruptly and I remembered all the attempts to rescue Sarah so she could make it to Bannerman road. That caused me to think, what if the Big Finish series came after the tv show. There might need to be some handwaving to "fix" the fact it was produced first (i.e. Why no Mr. Smith etc), but maybe Sarah didn't get rescued. Like I said morbid, but it would mean we actually witnessed Sarah's last adventure.