If both people aren't happy then having sex every day is not going to make the marriage better nor will not having sex.
There is no "right" or "wrong" in relationships. There is only "agree" and "disagree". The goal is to find someone who wants what you want.
Sex is very important in a marriage or a relationship that is "exclusive". If two people aren't "equally yoked" generally one person becomes unhappy enough to either cheat or leave.
If someone really did want to have sex 365 days a year and their mate was content with once a week you'd be looking at 365 times versus 52 times per year! That's a major difference to overcome!
Having said that when it comes to sex some people have higher sex drives than others. Unfortunately for those who do have high sex drives they aren't able to recognize their mate does not until after they've gone through the "infatuation phase" of a relationship.
In the beginning (both) people were looking forward to having sex often. After the "infatuation phase" concludes people revert to their "authentic selves". It's then where you discover who has a naturally high sex drive and who doesn't.
Unfortunately for a lot of people by the time they discover a major difference in their libido they have become (emotionally invested) or possibly married.
If someone has the view that sex is for their mate then eventually they'll come to resent it, not enjoy it, and if it's a woman have a difficult time experiencing orgasms. You can work to change your mindset and try to make if fun and look for ways to enhance the pleasure for yourself or you could decide to leave if it's a "deal breaker". People don't change unless they're unhappy.
There are only two ways to experience joy and peace of mind in relationships: We either get what we want or we learn to be happy with what we have.