Hi Phil,
I can assure you that JBL is not going away any time soon. Among Harman's brands, it's the oldest, stalwart crown jewel, and it generates the most income among our consumer, professional and automotive branded audio systems. As a business, Harman is quite healthy these days: its share price increased almost 175% over the past 12 months, and there are aggressive plans in place to grow the business even further.
While the economic recession and reorganization of the company may have slowed down the release of new consumer products over the past 2 years, I would expect that to change in the next 12 months.
Someone already pointed out that, with the exception of subwoofers, consumer loudspeakers with 12+ inch woofers are not popular sellers due to the large footprint/baffle they require. So, not many manufacturers are making them anymore. Even the Revel Salons and Studios don't use such large drivers but rather use an array of smaller drivers to give the equivalent or higher SPL but without the need for a larger, wider baffle.
The use of multiple subwoofers placed in corners or at mid-points of the room to cancel odd-order room modes, offer compelling benefits over using full-range main channels w/o bass management. Subwoofers also make mains channel speaker placement easier, reduce the seat-to-seat variance in response below 100 Hz, and make the bass more consistent from channel to channel. Purchasing four subwoofers and calibrating them would be the single largest improvement you could make to your existing setup. Our research has shown that bass quality accounts for about 30% of a listener's overall loudspeaker preference rating, so it's something you cannot ignore.
If you really want a JBL floor-standingspeaker with a 12-inch+ woofer you're going to have to step up in price to the
JBL Synthesis lineup that includes Everest, K-series and Project Array.
If woofer size really matters to you (and it shouldn't, given the alternative solutions I've suggested) then you are going to have a rather large wallet to acquire it -