If the F/A group is so up in arms over the current contract, WHY would any F/A concerned with work rules, Reserve issues, etc etc etc even think of doing a TDY assignment???? Remember a union is only as strong as its weakest member.
If you want a better contract you have to hit them hard right in the pocket book. TDY allows them to get off the hook and not pay for their poor management decisions and treating you like crap. Cancelled flights due to lack of crew HURT and hurt alot.
Folks, contracts like fare rules are written in the company's favor in most cases. You ALWAYS do your job and obey the rules until you can bend them to your liking. I know of no contract that disciplines for failing to be a "Company Man/Woman" and doing all kinds of extra stuff like ETB trips and TDY over a holiday.
Work your trips, smile, be pleasant and let the company do what they get paid for which is to manage the company. If you're not required to work, DON'T! Your kid won't remember that cool video game you bought with the extra money you earned on TDY but he or she WILL remember the time you spent with them instead of bailing out a smug, arrogant and disrespectful Management Team by working ETB or TDY assignments.