Let's revisit this in a year. I predict she will have sold a few million albums by then and have done sold out shows all over the globe.
Even if Susan Boyle never sets foot on a stage for a big show, she could entertain millions and make a good living for herself just by recording and selling CDs. Not everyone can make it to a live performance, but buying CDs is an easy thing to do, and you can listen anytime you want!