Bandai's not going to worry about a line like the X-Plus figures that much. It's not as if that line is treading in territory other figures haven't done before, and high-end collector's only giant figures aren't in direct competition. Kaiyodo, on the other hand...
Story time: Bandai has almost universal reign on Kamen Rider merchandise, old and new. They've been doing pretty good work lately, too, especially with the S.H. Figuarts toyline. However, due to exploiting a loophole, Max Factory was able to release their own action figure line based on the American adaptation of Kamen Rider Ryuki (Kamen Rider Dragon Knight, a decent attempt, but I digress).
So all those collectors that wanted Ryuki's cast in Figuarts form was able to skip waiting on Bandai to deliver and got a decent stand-in figure:
http://www.amiami.jp/shop/?set=english& ... splay.html
You can tell Bandai wasn't happy about this. They didn't have the luxury of shelving their planned releases, but look at what a few hundred extra yen gets you in August:
http://www.amiami.jp/shop/?set=english& ... splay.html
That's the kind of rivalry and one-upmanship I expect to see in some form from Bandai with the Godzilla Figuarts line. It's true that their hold over Godzilla toys meant Kaiyodo was never allowed to do Revoltechs of Godzilla, King Ghidorah, or MechaGodzilla, and I'm sure that was good enough for a while, but Kaiyodo didn't keep going with B-listers like Mogera and Baragon. They went right for Mothra and Rodan, and even Gigan. This isn't the same game Bandai's played with 6" vinyls, where no official alternatives exist. There's competition for collector dollars now, and Bandai crushes its competition. It may take time, as Tamashii reps have said that Bandai does want to concentrate on Heisei first, but I think you'll see them deliver eventually.
It's the bottom of the barrel like Kamacuras or Varan that are least likely to be shown any love, despite our desire for them. That's something I see Bandai waiting until the new movie is out to venture into, at the earliest.