Also remember that when D&D 3.5 came out, it was pretty much the only well supported RPG on the market. 3.0 was flawed, and 3.5 "fixed" a lot of stuff, so that was a draw to get on board the new wave too.
With Conan, everything pretty much works. Mongoose wanted to release a 1.5 with corrections and errata included, so along came the Atlantean Edition. Personally, I bought mine at full price just to support Mongoose as producing the "better sytem version" off of the D20 base.A lot of folks sent in thier page corner and were able to get the new version at a discount; a supremely generous offer on the part of Mmongoose, and one that garnered a great deal of product/brand loyalty amongst 3.0 and 3.5 defectors.
Now, I have to wonder why there's even a desire to release any form of 2.0 Conan. Honestly, the only thing I can think of is market pressure or a feeling in the design levels of Mongoose that Conan/Hyboria is too finite and that pretty soon they'll reach the end of viable topics to generate product off of. Both notions are B.S., frankly.
Market pressure would only be generated if there was direct competition, and the only forseeable competition is the on-line game. The RPG market itself is pretty volitile; we gamers tend to flip-flop on genres and titles at the drop of a hat,being totally into D&D one week and then Shadowrun the next. But you can't react in a print/book industry to that sort of thing - you have to just stick to your guns and continually make quality, consistant stuff until the line fizzles. Conan probably won't fizzle, anytime soon, thought, if the novels are any indication. So why bother with a 2.0 on the grounds of market? It makes no sense. The fact that there's a single, huge, $50 rule book seems to elude people as a wise choice for the line. Instead of having a PHB and DMG separate at lower prices, everybody playing the Conan game needs only one book, but they have to pay to get it. A wise business plan would take those facts into account - essentially, they make thier money off of the supplementary books and only break even (or even take a small loss) on main rule book sales knowing everybody needs one anyway.
Considering Hyboria and the Conan property too finite is ludicrous. Just doing supplemental material every 6 months on one country at a time would keep them in sales for a very long time. Books on NPCs, monsters, and varient/supplemental rules are the cash cow of any RPG line anyway. In most cases, game companies fowl up the supplemental product and we consumers are faced with $30 books of dubious quality and information. This has yet to be the case woth the Conan line, and as long as they keep the same writers and designers, I can't see the future looking real bleak in terms of supplemental materials for Conan D20.
Now, one factor that hasn't been mentioned is the Howard estate. If they say that they want unity between elements of the liscence, then Mongoose may have little choice but to change the line to meet that desire. If the Howard estate wants, for example, the on-line game to be based on 4 classes and 6 races usuing a percentile skill-based progression system, and if they further believe that the book-based RPG should reflect that decision, then Mongoose may be considering RQ to be the closest option to these wishes, thus opting to call it a 2nd edition jsut to save thier involvemtn in the property. That sounds like a far fetched idea, but it's essentially what happened to the recent Lord of the Rings game that, by the way, is no longer being published.*
* granted, that was also a factor of that lisence being so bloody expensive and Decipher already having difficulties in the RPG arena. That and being purchased by Wizards, who, if you haven't been keeping up, also has a popular fantasy role playing game with elves and dwarves and halflings...