Kael: I won't speak to the technical aspects until I've researched that a little, but what you describe really doesn't sound likely. It wouldn't make sense for torrent clients to continually query a client just because they saw it on their DHT. They query, the client doesn't answer, they remove it from their local copy of the DHT. That seems to make most sense. The biggest problem as far as optimization for speed is concerned in torrent clients is the amount of connections; any client optimized for speed will keep these down to a minimum. Thus, continually querying an address just for the off-chance it might come back is silly for the client. Evolution in computer design suggests that those clients which are now the biggest (Azureus, BitComet, µTorrent) have become the biggest because they delivered the best functionality (speed being the largest factor in there), so we can deduce that this sort of behavior will not be found in them.
Maybe I should watch less House
As I said, I can't speak to the technical aspects because I don't have any facts. What I can speak to is my own experience. I've been using µTorrent for a long time now (and other torrent clients before that), and I've never had any kinds of problems with bandwidth after turning off the client. Also, the reality of the situation is that most people out there ARE already using Torrent clients. It's the de facto standard of p2p these days, and I find it incredibly convenient. I'm not alone in that.
As onedreamer pointed out, there's no reason why we shouldn't have both. The vast majority of gamers, who already have a torrent client installed anyway, can get the torrent, and those who don't want to install a torrent client can get it from 3d downloads. Really, no activity on your side is required, Kael; a simple "okay, do that" will suffice and we'll take care of it.
Also, as one person expressed that common misunderstanding a little earlier, I'd like to point out once more that we would not host patches on torrents. That doesn't seem to make much sense. We'll only host the MAJOR versions (like 0.22, that will be the next major version), which run up to around 280MB right now. The patches would still be distributed through the civfanatics download system, as before. A new major version is released what, ever two or three months?
So, a summary:
a) torrents as additional option. For Kael, everything remains the same: he still uploads a new version on 3ddownloads or whatever, and the first torrent-guy to download it from 3ddownloads puts it into a torrent and posts the link for the torrent. This is only done for major versions
b) most gamers will have a torrent client installed anyway. No one will need to install a torrent client just to get FfH. However, if an outage should happen again as happened these days with 3ddownloads, there will be another option. Also, since 3ddownloads doesn't work well with download managers at all, we now have resume.
c) all we need from the team is a little "okay, do that".
And as for the alleged horrors of BitTorrent, I'll make some research and get back to you. I can only repeat: I do not have any kind of problem here.