" She wants to be a professional singer. The whole world is going crazy for her. I think at the very least she will achieve that aim."
After a shaky performance of " Memory" in the show' s semi-finals, when she was occasionally out of tune and out of time, some fans on YouTube have questioned whether she can handle the weight of expectation.
But Boyle, whose world has turned upside down in just over a month, insists she will keep her feet firmly rooted to the ground.
Asked by King if fame would alter her, she demanded: " Why should I change?" adding her celebrity meant " I certainly won' t be lonely any more."
Despite her newfound fame, unemployed Boyle still lives in social housing outside Edinburgh with only her cat, Pebbles, for company.
She had auditioned for television talent shows and sung karaoke before " Britain' s Got Talent" but Boyle never got a break and all but gave up on singing after the death of her mother, who she nursed to the end, two years ago.
Boyle was reportedly starved of oxygen at birth and bullied at school. When she first stepped up to the microphone on ITV' s " Britain' s Got Talent" , it looked like the jibes would continue as audience and judges laughed at her frizzy, greying hair and thick eyebrows.
But the woman dubbed the " Hairy Angel" by Britain' s press silenced them all when she opened her mouth to sing -- and has not looked back since.
As well as an endless round of talk show appearances -- particularly in the US, where Oprah Winfrey was among those jostling to speak to her -- Boyle has been namechecked by TV shows like " The Simpsons" and " South Park" .
Meanwhile, her humble home in Blackburn, central Scotland, has been besieged by journalists and photographers recording her every move -- including a makeover when she had her hair dyed and eyebrows plucked last month.
Part of the reason for her success is the Internet. Her army of international fans would have struggled to hear of her without YouTube, where her " I Dreamed A Dream" clip is reportedly poised to become the most popular of all time.
Twitter has also helped -- when Moore wrote that Boyle' s performance had " made me teary" soon after her first appearance, it got picked up by hundreds of media outlets.
But Boyle' s quiet determination to succeed against the odds and refusal to let success turn her head has also tapped into something far more powerful than mere technology.
" Susan Boyle is the ugly duckling who didn' t need to turn into a swan; she has fulfilled the dreams of millions... downtrodden by the cruelty of a culture that judges them on their appearance," commentator Melanie Reid wrote in Britain' s Times newspaper last month.
Morgan has highlighted her emergence " out of nowhere... (to become) the world' s champion" as central to her appeal.
" What Susan Boyle has single-handedly done is give us all something to smile about and feel optimistic by and inspired by," he told King on CNN.
" It' s a fantastic achievement to make the whole world grin and talk to each other and say, ' have you seen that clip?' "
Boyle is the bookmakers' hot favourite to win the " Britain' s Got Talent" final, when she will face nine others including urban dance troupe Diversity and 17-year-old singer Shaun Smith.
The winner gets to perform for Queen Elizabeth II, plus a cheque for 100,000 pounds (115,000 euros, 160,000 dollars).
Whether or not she triumphs, the future looks bright for Boyle. She is reportedly set to sign a record deal, cut an album of show tunes and could even land a role in an Andrew Lloyd Webber musical in London' s West End.
