I hope they don't get involved but then again if they did it wouldn't hurt Dean's credibility too much if any at all seeing as it would call for him having to get jumped by Bray's goons.. If this happens at TLC I can see (but not expect the creative team to do so)Roman Reigns and Cena coming out to make the save/clear the ring and then set up a Dean/Reigns/Cena vs Bray/The Ascension ME on the RAW that follows TLC.
I have a feeling somebody is going to get involved, The Ascension, possibly... To further cement and then end Wyatt/Ambrose feud at the Royal Rumble. That's just me, though.
Speaking of Reigns and Cena coming out to make the save and then set up a 6 man tag team match on RAW the following night... Yeah, why not? That'd sit well with me.
Reigns said he'd be back by/at TLC next month, so, it's a plausible scenario that he and Cena would get involved to save Ambrose.
It's also rumored that WWE's considering another big match for TLC... And that is Cena vs Orton vs Rollins in a Triple-Threat match, that'll be the case if Lesnar vs Cena doesn't happen. Either way, it looks like Rollins will be in the Tables, Ladders & Chairs match. If the three-way doesn't happen, the other option being considered is Rollins vs. Orton.