I think Mao and Yu-Na are fantastic skaters and have more technical ability than Sasha or most skaters ever managed. I also LIKE Mao's presentation, she's gotten a lot better in that respect, and I enjoyed her skates at NHK a lot. But there's no comparison to Sasha in artistry.
Just what exactly is artistry???? Skaters are not marked on "artistry" in competitions
And as far as "there will never be anyone like her" -- you're probably right, because we have a system now that all but ignores artistry. I still see some beautiful skates, but most of the time they are from the older group of veteran skaters, who generally don't have the point scoring ability to compete in CoP. There was a list of ladies who will probably retire in or before 2010. We'll be losing most or all of the remaining skaters that have ever competed before CoP. I'll be very sad on that day...
"There will never be anyone like Sasha" that is entirely subjective, you may go ga ga all over her, others find her boring. Anyway there is a simple solution, which Sasha herself is going for, i.e. don't compete in ISU competitions anymore, just do show skating. Seriously when Sasha was doing competition, she got me at the edge of the seat, will she flop and fall on the jump, 2 foot, scratch out, hands down, pop, over rotate? All those mess ups do not contribute to the overall continuity and "art" of the program JMO of course.
Back to topic, kudos to Mao, she is not just going for a medal, she is trying to take risk and advance the sport.