The biggest problem with it is who do you talk to when they tick you off? (And they will tick you off at some point.) From what I have seen it rarely works. It is better to find someone new who not only is your partner in life, but becomes your new best friend. But you still get t keep your old sounding board.
Do you guys think that if boy/girl best friends begin dating, they have a greater chance of staying together?
No.
Staying together (marriage) requires a choice, a promise, and a commitment.
Any two normal adult human beings are capable of having a good marriage.