We can expect the defendants to move to dismiss the case on the merits, on grounds that their conduct is protected by Section 230 of the Communications Decency Act [3]. Whether they'll succeed is another question, especially as to Pinkmeth, and Tor might have an uphill battle as well.
We can also expect the defendants to move to dismiss on procedural grounds -- they will claim that they don't have enough contact with Texas to be properly subject to suit there (here) [4]. That too will probably be the subject of "satellite" litigation in pre-trial motion practice.
This won't be an inexpensive exercise for the defendants, just in terms of legal fees.
[1] http://en.wikipedia.org/wiki/Removal_jurisdiction
[2] http://en.wikipedia.org/wiki/United_States_District_Court_fo...
[3] http://en.wikipedia.org/wiki/Section_230_of_the_Communicatio...