I have had BL8000 + BL2 for many years (bought the BL8000 around ~2000/2001, and the BL2 shortly after it was introduced). Adding a BL2 to a BL8000, in my experience, offers a tremendous improvement, but there is still something missing (to my ears). Therefore, I bought a pair of BL1s a few months ago (BL9s too expensive and wife didn't like them), and feel these are quite superior to the BL8000 + BL2 combination. I don't understand people who say they like BL8000 or BL8000 + BL2 better than BL1. I have heard that the BL1s need a large room to really sing. My room is not that large, but it does have a very high ceiling so maybe this helps, because they sing beautifully.
I've been trying to figure out whether I like the BL1 + BL2 or prefer to keep the BL2 paired with the BL8000s. I hear a subtle improvement to the bass of BL1s with the BL2 (but also hear a bit more sharpness in the higher frequencies), but now the BL8000s (moved to my office) sound a bit weak without the BL2.
I think it depends on the price of the BL1s vs BL2. If the BL1s are not that much more than the BL2, I'd go with them (I paid about 1000USD more for my BL1s than I see BL2s go for on eBay which I thought was an amazing price). With the BL2, you have a smaller price, but your end result will not be quite as good (but it could be good enough for you, I was quite happy with this combination for many years). The BL1s are better, but perhaps for TV they really would miss something without the BL2. I guess I'm with Biele - assuming the BL1 prices is not fabulous, go with the BL2 - you can always buy the BL1s later...
I wouldn't worry about that fact that they are no longer in production. People still rave on about the BL5000s or Pentas and these have not been available for many years. My BL1s were manufactured in 2000 (I've opened them up and seen the tags). The drivers still look brand new.
I listen to music 100% of the time.
Stan