Can you guys give your honest opinions on this situation pleeeeeeease .... :)?

[Panther]

A couple who are my friends has for long been arguing and fighting for even the silliest of reasons..They are so distant that the latest is that after their 3 year old child was concieved,they did not even have physical relationship for the last 3 years..just living like room mates for the two kids they have..its only for the kids issue they have some unity.Both of them have high tempers and neither the husband nor the wife wants to back out..its not intentional they say and it just happens..The husband specially has lost all apetite for sex with his wife as he says that attraction is not there due to her temperament. They tried counselling several times and it is better for some time,but it gets back to this after some days..the happiness is only about the kids..What is the best possible solution..some say its divorce..others say they should stay on and make it(adjust) work somehow for the kids sake at least.....but their marraige was in 2001 and its 9 years since then its been the same..it never really worked..what do u think is the best???