It must be disappointing, though, after many years of work both in the studio and on tour, to see the number of fans dwindling rather than growing.
I'm not sure that's the case, a dwindling fan base, per se. "Shrinkage" does exist to some degree, but the very fact that Robert's out there, driving cross-country, connecting on so many levels, making considerable effort, does in fact continue to maintain, even raise, his profile. We all know that such a "fan base" doesn't number in the millions much like the average pop/rap/hiphop star, and never will - such is the name (fact) of the game.
I certainly understand Robert's concerns. That being said, pre-sales for his OTP gig here this Saturday have been strong & steady, and I expect his to be OTP's largest attendance thus far, previous respectable-sized turnouts notwithstanding.
(And, in the spirit of this thread, might I also suggest that those forumites still considering Robert's upcoming performance @ OTP show their support by attending - I expect his show to be one of this year's highlights!)