Certainly, some guitar players are intimidated of that extra low B string; one factor as to how well these guitars sell in the market. It takes a certain attitude and style to "master" a 7 string and make it sound different.
Sadly, owning a 7 string nowadays is related in the same sentence as Korn. *I'm not a big Korn fan but I give 'em credit for expanding the 7 string market in general. *I don't quite understand that owning a 7 string essentially means you're a Korn fan (or a nu-metal fan), since Korn is presumed to be one of the few bands who uses 'em exclusively. Sure, they are other bands out there who've used their 7 string live and recordings, ranging from Meshuggah, Morbid Angel, Fear Factory, etc. Sadly, Ibanez doesn't give these bands the appropriate recognition they deserve. Ibanez's reincarnation of the 7 string guitar (in it's RG format) has always been marketed for and appealed to Korn fans; NOT Morbid Angel fans, NOT Meshuggah fans, neither <insert your favorite band> fans. It is perhaps during this reincarnation, other companies started to offer 7 strings as well, flooding the market with "Ibanez 7 string" copies. This is a case when surplus exceeds demand. This will eventually cease low/lower-budget 7 strings, especially "Ibanez 7 string" copies.
The Universe series is still marketed to a much wider audience, Vai fans and collectors alike and still continues to hold the "Godfather of all 7 strings" title. The guitar screams Vai no matter what you do to it, but it took a certain post to discuss Vai-ism vs. owning his guitars. My point is, just because you own a certain band/person's (signature series) guitar doesn't necessarily mean YOU have to play the same style they're playing.
To me, if a 7 string is limited and viewed as an instrument to play heavy power chords within the "nu-metal" sound, the instrument will not be around for long. It is relatively a "new" instrument but it doesn't necessarily mean it's for "nu-metal".
The RG2027X is a very ground-breaking instrument but i don't think there's a big audience for 'em since i don't think a major band like Korn (or Vai) would have a use for 'em (therefore its discontinuation). It is a very promising instrument for those who want to play a 7 string without being limited to the "nu-metal" sound. That's why it's next on my wishlist
I've been playing more than 8 years. I have a wide variety of influences ranging from classical, alternative (i.e. Tool, Soundgarden, etc.), death metal, and among other things (Vai of course) but "the Korn-style" grooves hasn't influenced my playing in any way.