Clearly carbon is the state of the art for hi-performance road bikes (I have 2 including my P2 and am 100% sold on carbon for that type of riding), BUT... I've been very happy with my Litespeed Ti MTB and would hesitate to subject a carbon frame to the kind of abuse it has repeatedly taken on the trail. If the cost were more reasonable, I'd also love to have a heavier-duty Ti road/touring frame for mixed paved/unpaved riding and/or foul-weather duty (lots of low-traffic logging roads around here for winter training to avoid major roads in poor driving conditions; my current "Frankenbike" is steel just because it's cheap, but the rust clock is ticking and it weighs a ton)... I don't see many carbon frames designed for that type of application, where you may want to add on fenders, or a rack, or rig extra mounts for lights, batteries, etc.
So, I believe Ti definitely still has a place and wouldn't be so quick to dismiss it entirely as a solid material choice for bikes, but I do agree that it would be poorly applied to something like a Soloist. The problem these days as has been alluded to above is that the designs are too focused on weight, where the strength of Ti is in its durability, so the current market of superlight but noodly Ti frames is off-target. You could add more material to make it stiffer and still have it be lighter than steel without having to worry about corrosion, and have better durability than Aluminum as well... but then I realize it's a small niche of folks like me who would pay that much for what amounts to an expensive "beater" even if it lasts forever.