To me, all 'soft' leftism converge to more radical socialism in time, if economy can withstand it of course. In social democracy once you start, you never stop. More publicization, more taxation, more government regulations, price caps, wage controls, social spending, more public workers.. Whether you prefer it that way or not, government and state just gets larger and larger. Usually before being `socialist` economy goes bust and people selects a more conservative government. After a while, left comes again with the same populist ideas and cycle continues.