Sure thing. You can say about BSD as not all major players today deploy BSD servers, but the community is strill thriving. But I bet to you FFOS is going to be a much smaller community over time and eventually so small only those people are dogfooding themselves. Code will live on but nothing else and that's why people called it dead.

There is a difference between dead in popular perception and dead eternally. Eventually you will left with maybe one person looking at the code and then nobody ever looking at the code even on a monthly basis.

Who knows.