Who won't get an ultimate due to lack of accessories?

Right now, of the names you listed, I would say only Luger, Sid and Booker T would have the chance of getting an Ultimate Edition figure. For Sid, it would be a bit tough, as he didn't have a lot of accessories or ring gear that could be added. Though, they did make the Diesel figure and all he came with were extra hands and the vest, so they could do a 1996/97 Sycho Sid and include his entrance vest, add a few heads, and throw in the WWF world title belt he wore during they time.

Booker T is interesting, I don't think they would make a Harlem Heat Booker T, so that leaves his singles run in both WCW and WWE. I stopped watching wrestling around the time he really became a star in the WWE, so I'm not sure about his attire choices. I remember him wearing sweats and t-shirts for certain segments. Didn't he wear regular clothes for the shopping center fight with Stonecold? They could throw those clothes in with any ring attire look he had from that time.

As for Luger, the most likely Ultimate Edition would be his Summer Slam 1993 look. It was a unique attire that he only wore once. They could do multiple heads, hands, and the USA jacket he wore around that time (also worn when Undertaker was named as the 4th man of his 1993 Survivor Series team). Others have said that they'd want his USA shirt and zubaz pants that he wore on the Lex Express tour added. If they were to go the WCW route, he did wear a strange looking entrance gear during his first run with the company, they could add that along with multiple heads, hands, and the WCW replacement world title or US title.

Here is an image of him in the entrance gear, and the prototype of the galoob figure that was going to have it as well:



He also had a robe made when he was a member of the 4-horsemen, I believe it was made by the same person who made both Flair's and Valentine's robes. This could also be an option:


I don't think that Mattel does multiple looks (2-in-1) for their Ultimate Edition figures, but WCW Luger could be an option. He wore the same black gear with white boots in his 1st run with WCW as well as his 2nd run. They could include the entrance coat/cape thing from the photo above (or the robe), the black trunks and kneepads attire with white boots, a younger head for late 80s/early 90s, and an older head for 1995/96/97. They could also throw in the TV or US title from the late 80s and the big gold belt or TV title from the mid-late 90s that he wore. 
 
Late 80s look                                                                                          1995/96 Look

Bruno could come with nothing, but hands and heads.

Referring to Booker T - I really want a King Booker, could be awesome

Bad News Brown

You could make a pretty good ultimate Sid in my opinion:

3 heads - regular expression, eyes closed/laughing expression, and then his wide eyed maniacal expression.

WWF World title.

Leather vest.

Maybe a pair of soft goods blue jeans to make his “out of the ring” look.

I can’t really see anyone being off the table as long as they’re a big enough name. They can always fill it in with heads, hands, t-shirts, etc. - Don’t the upcoming Jake Roberts and Rick Rude only have one accessory each besides heads and hands?

Pillman could come with those flip-up sunglasses, a crutch, vest, Hart Foundation shirt, necklace, and mic.

Yeah Sid would be easy. Black attire, vest, Big Gold Belt, Winged Eagle, mullet hair, shorter hair, crazy facial expression, claw hands, just bring it hands, fists, grips.

^ This

I feel like if Brock got Ultimates, anyone will. He isn't really an "accessory" guy....

But the line might be more limited just due to the number of slots available - they put out what, 10-12 per year? Coliseum Collection will be LJN based... and how many slots in the regular Ultimate line have gone to Warrior, Hogan, Bret, Rock, Savage? So I see them sticking more to the "top names" and it'd be a while before we see some of those WCW guys (Sid, Lex, etc). But it wouldn't be due to lack of accessories....