In defense of Triumph, they may not know about the issue.
If most of the problems have gone direct to the dealer and the vehicle is out of warranty when it's repaired for this problem, that information will never travel up the chain to where it needs to go and it'll die with the dealer.
If it is under warranty, which is sounds like it is since it's a MY07, then that news most certainly will travel up.
If you're that upset about it and you think it's wrong and should be a recall, file a NHTSA complaint. That will certainly get their attention when more than one of them comes in. Looks like we have two so far, you should be the 3rd. It's not too hard to fill out the form and hit submit, in the end, it'll help all of us.