There is nothing wrong in theory with Nepal Sambat vis-a-vis Bikram Sambat! Both work on parallel principals. However, it does not matter how traditional something is it is bound to face competition from other contemporary counterparts. Bikram Sambat broght in a challenge to Nepal Sambat with vigour: Nepal Sambat is based upon the moon's positions arond the earth like many other lunar calendars; Bikram Sambat as we know today is a solar calendar. When you adjust the solar calendar to align with the position of the earth against the Sun, you do so by adding a day every four years whereas you add a whole month in the lunar calendar for the same purpose. The reason is, the granularity of the soalr system is much more precise, so to say, than that of the lunar system. You can see the sun every ~12 hours with almost no difference in the phases of the Sun versus every ~15 days, with differences in phases of the moon every day. In this world all lunar calendars are slowly vanishing. On the other hand, Bikram Sambat is itself facing stiff competition from the Gregorian calendar. You want it or not, we are on the verge of giving up both of our national heritages! So now the debate is not Bikram Sambat versus Nepal Sambat, but 1969 versus 2025! Do not forget our tithis are still based upon a lunar calendar. If you are a computer wizard, probably you have felt that the decimal system is no match for the hexadecimal system. Just like any number can be represented using the decimal system so can be using the hexadecimal system(it might take another 5000 yrs, though, for the hex to take over). The parallels are very similar to our calendars. Would I be surprised if one day the good old reliable decimal system becomes a history! By the way the decimal system for that matter modern arithmetic is borne by our ancestors (meaning from the Indian subcontinent). But when times come you have to say bye-bye!