The reason why Sister Schubert sausage wrap rolls was discontinued is because they were not selling good enough.
When something is not selling good enough it's not feasible to continue making the product when it's not making enough money for the company.
The Sister Schubert sausage wrap rolls were replaced with sausage pinwheels.
The sausage pinwheels that replaced the Sister Schubert's sausage wrap rolls are similar but with a different format.
Ultimately it was just a business decision that was based on sales performance that caused Sister Schubert's sausage wrap rolls to be discontinued.
Sister Schubert often discontinues products that are not selling as well as they expect and the sausage rolls fell into that category of low selling products.