Your asking me if the boxes are active? It seems unthinkable, Unthnkable, that someone who is making an argument would ask the other guy for the burden of proof.
Anyway, here is your proof, an article from the October, 2004 issue of PCWorld:
http://www.pcworld.com/reviews/article/0,aid,117346,pg,1,00.asp
Here are a couple of blurps from that article:
"The PC World Test Center in San Francisco has a Comcast set-top box for TV testing; its FireWire ports work (for now), but Comcast may disable them."
Here is the MPAAs view on all of this:
"The MPAA has pressed hard to restrict unfettered access to HD signals, fearing massive losses should content end up on the Internet. The group has even lobbied Congress to mandate that component-out ports--the only available HD connections on millions of HDTVs--be dumbed down to standard definition (SD) TV levels to prevent unauthorized copying."
I really hope that the MPAA doesn't manage to get component out ports dumbed down! The funny thing is that won't prevent unauthorized copying, it will just mean the copy isn't the same quality as the broadcast. You need a real time HD MPEG encoder for that anyway, I haven't seen one of those yet.
Anyway, according to that same article, the FCC REQUIRES Firewire on cable boxes!
"In April the FCC began requiring that cable operators provide set-top boxes with FireWire outputs--a welcome development even if these ports will likely be encumbered with copy protection. However, the 8000HD set-top box likely won't receive a firmware update to enable its FireWire outputs until the end of this year or early next. Even then it will continue to bug me that I have to watch HD shows on someone else's schedule."
This copy protection they are talking about is that broadcast flag I mentioned earlier.
Regardless, if the FCC requires it, then I don't think comcast will disable their ports....
I have provided enough proof to support my argument Unthinkable, I don't think your argument has any credibility.