The 2013/2014 model was great by itself IMHO. It had some flaws, but it could have had much more success if they gave it some more hype, some better presentiation videos, and some more lifespan.
The thing that cut legs the most to the old models was the pickup. Way too many pieces had the "chorus" effect, caused by these very pickups pulling the strings too much: that decieved many potentional buyers.... just go check the EB thread. Hopefully they had been fixed before landing on the Thunderbirds and on this new one. Also, inconsistence in fit and finish have been documented.
As for mine, most of the original electronics are gone. It just couldnt sound right. But it was so comfortable and good looking to me that I took the leap and modded it and it's sounding great with EMGs.
What if they took the EB4 and gave it functioning pickups (also prettier, if possible: those large exposed poles are not so Gibsony or pretty to me), a "branded" truss rod cover (instead of plain black-it's just anonimous, I got myself a sticker made for it), keeping the coil splitting and maybe adding some series/parallel toggle (meh, didn't some old Gibsons even had the chance to go out of phase? Now that is the Gibson quirkyness I like). Eventually a "normal" finish? I love the thin, grain showing one, but many many people disliked it. I'd live over a plain solid coat if it made the model live more.
Just a pair of cents.