Difficult to say, as software based boards will always last longer then any hardware based board. (Had the Abacus since about 2003/2004)
On the other hand, as a new OS brings a new board, (Although the physical side remains the same) I’ve actually changed it twice, with a third one coming up in the future.
Confusing, I think I will leave it to each person to make up their own mind about it. (Don’t forget to take into account that you cannot play any of the sounds and styles on later OS versions, on an earlier OS)

Bill