I don't understand what you are complaining about, as SAS does not have any business class anymore on european routes. Plus is a simple form of economy extra, where the biggest advantage compared to go is the flexibility in the ticket, in addition to lounge access, free food, extra luggage and more seats pr. person if the total number of pax allows it.

Considering the price of SAS Plus (which usually is fairly close to Go, especially when A-class tickets are available), I think the product is just fine.