funny how representative democracy can be...well...representative. Nil aon leigheas ar an ngra ach posadh
In any case your examples point to a separate problem for would be economically left wing voters in Europe - i.e. that their political representatives aren't able to bring themselves to fully get over their longstanding belief that left wing economic policies have to come with repression and dictatorship.
In decline? Certainly, has been for a long time. But still there are pockets of resistance. And there have also been other periods of decline followed by big come-backs. And my guess is that there will always be at least a dozen in parliament, no matter what the PS tries to do. Nil aon leigheas ar an ngra ach posadh