Ayumi's singing career will end when she says her career will end. I don't think she'll be making albums after the next 10-20 years. But that's a LOOOOONNNNNG time from now. She can always produce. I'm sure she could do that just as successfully as people like the Neptunes and Kanye West. Producing is a FANTASTIC career path.
Personally, I think she'd be even better as a professional producer and/or song writer than she is as a singer. A lot of her songs are really well arranged and written but I can't help but imagine someone else with better vocals singing some of them. It reminds me of Dolly Parton's "I Will Always Love You". Very deep love song that she did a while ago. But it wasn't until Whitney Houston made her rendition of it that the song reached it's true potential. NOT saying that Ayumi's songs aren't good or anything! Oh boy, hope I didn't offend anyone with that.
So when she stops singing, she can still be huge. Like a female Timbaland!
