His motive, presumably, would be to be reinstated by the U.S. Anti-Doping Agency and resume his cycling career.
Armstrong's attorney, Tim Herman, has responded to these reports by assuring the public that no such admission has been planned and that if Armstrong had something to say, there would be no secret about it (h/t the Associated Press via Fox Sports.com):
Lance Armstrong's attorney is denying a report that the former cyclist will admit to doping charges that cost him his seven Tour de France titles.
Lawyer Tim Herman said he has no knowledge of Armstrong considering a confession.
"When, and if, Lance has something to say, there won't be any secret about it," Herman told The Associated Press.
With the conflicting reports, it would appear that, if there is a chance Armstrong will make an admission, he's clearly not comfortable with it. And if he sits back and evaluates the situation, he should decide to just stay quiet and continue along his current path.
Armstrong was stripped of his seven Tour de France titles and received a lifetime ban from cycling in 2012 after a two-year investigation by U.S. Anti-Doping Agency indicated that Armstrong had used PEDs and blood transfusions during his career.
At the time, Armstrong neglected his right to appeal USADA's decision. After fighting allegations throughout his career, the legend told fans through a statement that he was tired of constantly defending himself and had moved on.
In the court of public opinion, Armstrong will always be a polarizing figure.
Those who are against Armstrong will always insist that he cheated and was a black eye to the sport. Those who support Armstrong will always insist that he is a legend of the sport and should be remembered as such.
If Armstrong makes a weak confession just so that he can continue his career into his mid-40s, he will be turning his back on the fans that have consistently defended him throughout his career.
At 41 years old, Armstrong's best days as a cyclist are over. He last competed in 2011 and was no longer one of the major players in the sport.
Fans of Armstrong will always remember him as the seven-time champion who dominated the sport. If he officially throws that away so he can ride in a few more races, he'll be doing much more harm to his legacy than good.