TNA would be foolish not to at least take a look at some of these released talents, including Nemeth, AKA Briley Pierce. TNA might spot a diamond in the rough that WWE simply didn't see.
However, in my opinion, it'd be a waste of time and energy to scoop up Nemeth just for the sake of, metaphorically speaking, hoping that they can somehow stick it to WWE. Nemeth has only been wrestling since 2010 and has literally spent his entire career working in either OVW or in WWE developmental. The fact that he's Dolph Ziggler's little brother is pretty much the only thing resembling extraordinary that he can lay claim to. Aside from being Ziggler's little brother, Nemeth has no reputation of his own.
If TNA were to scoop up Nemeth, I highly doubt he'd be put on the main roster immediately. Aside from causing animosity between Nemeth and other young wrestlers in TNA's developmental program, some of whom have most certainly paid dues, it'd be seen as a weak & transparent attempt to try to, as I said earlier, stick it to WWE. TNA probably wouldn't be doing Nemeth any favors in the long run either. If TNA ultimately wants to ascend to another level, one thing they shouldn't do is worry about what WWE does just for the sake of being able to say they took a cast off and made him a star. If TNA signs him and can make him a star, more power to 'em, but it'd be an empty & fruitless gesture to have Nemeth debut to compare himself to his brother, especially if he really isn't as talented as his brother and people are able to clearly see it.
If TNA signs him, they're better off letting him do his own thing and develop his own personality rather than simply have him as Dolph Ziggler's baby brother intending to step out of his older, more accomplished brother's shadow. WWE did that with Owen Hart and while it did lead to some great moments between himself & Bret Hart, Owen will still always be remembered as Bret Hart's little brother and was never able to step out of his shadow. While it's true that it wouldn't be exactly the same scenario as both men would be in different companies, but that means that TNA would really try to follow through and just hope that he has the stuff. Otherwise, he'll always be Ziggler's little bro and he'll be saddled with it for the rest of his career.