It appears as if we're out of space, again. Even though the bandwidth was increased in the last few years with the WoM/Project Cavalry bandwidth reclamation projects, not long after that, as other national nets(BBCA, Fox Soccer, etc) are added, we'd lose another premium channel until now where we have just the one per network left. While there are 1GHz and 860MHz systems in this market, there are still quite a few 750MHz systems. It's speculated that in the interest of keeping the channel lineup somewhat uniform across the whole market, those who have 860MHz/1GHz systems, while having plenty of bandwidth, are losing out on having more channels due to accommodating that uniformity with the lower bandwidth systems. It is also believed that Comcast expects those who want to see programming from those premiums channels that have been removed use their VOD OnDemand service to view them, of course, this leaves TiVo/Moxi/computer users out in the cold. On the other hand, since those numbers are so small I expect Comcast feels them to be inconsequential.
Also, as I've noted before, the San Francisco bay area market has the first or second highest number of local channels in the nation, all of which use or want bandwidth on the local systems, and that certainly chews up bandwidth as to date Comcast does not further compress those channels, providing them with a full 19.xMHz slots per channel/station.
SDV has also been shelved indefinitely here as well, so there does not appear to be any relief or chance of getting those multiplex channel back anytime soon. Possibly when/if Comcast goes to packing more channels per QAM and/or moves to MPEG4 distribution maybe we'll see them again.
There has not been any sort of announcement about a price reduction/accommodation for the loss of those premium channels either, it's $20 per month per network, whether you get 1 channel(SF bay area) or 5-6 channels per net(other Comcast systems across the country). I expect the Comcast position would be that when we were getting those extra channels we were getting a deal, getting them "for free" in other words, now we're getting what we're paying for and no more.
P.S. While I don't recall where I read it, it has been said that Comcast is reducing the amount of premiums across all their systems, focusing instead on the use of the VOD product for viewing. So while it's not happening everywhere yet, the scuttlebutt is that it's going to. Maybe you might get some insight from your connections with Comcast.