But you don't have to move it along. It's your choice if you want to continue along the path you're taking. If something goes against what your character would want to do, then don't do it.
Spoiler If your character doesn't want lycanthropy, then turn it down and leave. The Circle are werewolves.. they have been for a few hundred years. They aren't going to suddenly let a non-werewolf in just because it'd "ruin your role-play". If you take it anyway without a good reason for your character, that's no one's fault but your own.
I'd agree that more choices would be good (or for the game to even acknowledge and respect your choice; actual 'yes' or 'no' options, not this 'yes' or 'later' crap), for instance at least being able to continue doing radiant quests without advancing the story, if not an alternate path. But it's not the game's fault if you do something and can't think of a good reason for your character to do it. There are other quests to do. It's not like the guild quests are particularly long anyway.
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As I said in a following post I did do that with one character. Now Aela is forever standing in the Underforge waiting. I lost one of the more interesting Companion members, my favorite archery training, and can not finish the Companion quest line. Other things to do, sure, but if you are a Nord warrior wanting to make a name for yourself your common sense just ended that career.
The VL and WW forms are really fan service to Underworld lovers, but are just awful in my opinion to play. Change to VL, kill, change back, loot, change to VL, kill, change back, loot, change to VL, get stuck in door, change back, go through door, change to VL, kill, etc. and etc. It was just a terrible experience. Most the times I was killed was because I'd get backed into a corner in 3rd person and couldn't target anything because of the camera angle. I also didn't really think the rest of the game was really playable after you became VL. TES has never been about playing vampires, but playing heroes that kill vampires. This DLC just was wrong on many levels. But it's over, it's done, and maybe we can get a DLC that follows the more classic TES Hero fights evil scenario. Oh look, we can build a house....