First off, let us just say that were a hotel to pop up as they want it to, and assuming it compliments the structures already there, we'd welcome it with open arms. A boutique hotel where we could enjoy an evening before catching an 8am JetBlue flight? Yes, please. A boutique hotel that preserved Saarinen's designs and allowed us to actually get in there and enjoy them? Now we're just drooling. Alas, the structure has a list of unfinished past development plans, to which we'd just add this hotel.
The idea won't work for many reasons, one being that the area between the TWA Terminal and the new JetBlue T5 isn't all that spacious; we believe it was being used a small parking lot for construction workers the majority of the last several years. Another potential problem is that the famous "tubes" that once took TWA passengers from the swank departure lounges out to their planes (you can see one in the above picture) have already been connected to the JetBlue terminal. And finally, it's taken whatlike 10 years since closing in 2001 for them to even have this plan? And we're not even going to get into the possible security issues.
Yea, sorry. It's not happening.