Kidney is facing calls to resign after Ireland's defeat to Italy on the final weekend of the tournament condemned them to a fifth-place finish and their lowest ever world ranking of ninth.
Ewen McKenzie is being linked with a move to Ireland after he announced he would be stepping down from his role as Queensland Reds head coach at the end of the Super Rugby season.
Heaslip praised the Ireland management team and he believes there are positive elements to be taken from the Six Nations - but also some tough lessons.
"Our experience with the coaching staff, the management staff, the strength and conditioning, the facilities we had was all amazing, everything else going forward is outside of our hands regarding whatever is going to happen," Heaslip told Press Association Sport.
"There is a sense of frustration from what happened.
"There is a bit of optimism as well because we had such a young squad. In every game we created a lot of different opportunities but we have to learn how to be more clinical with the ball.
"I think we have built a lot with this young team. A lot of experiences have been had. We want the squad to get stronger in the future."