Not sure it will discourage premium travellers, who in Europe often seem to get off on looking smugly during loading/unloading at those who have simply written a smaller cheque (or who havent had the benefit of a company to write the cheque on their behalf), and are forced to sit at the back and suffer even more cramped conditions and inadequate catering!
The lack of a scrap of material separating the two cabins is more likely to become a problem ro cabin crew, repeatedly asked by the economy rabble if they can have a newspaper, hot towel or whatever as supplied to the 'better' class of SLF who have simply paid more.
One of the reasons the low cost, one-class airlines have taken so much traffic from the premium option carriers is because business travellers whose companies will only pay cattle class prefer the great leveler of a single class cabin.