This is literally the same Polish succdems did. Won a landslide, nearly constitutional majority in 2001 on still succdem but solidly left succdem platform and them proceed to realise nothing of it but tons of neoliberalism, possibly expecting to steal liberal voters and become a huge centre-left block. In reality, 8 years later they got completely ejected from sejm because they lost entire left even their traditional succdem voter block and did not got a single lib voter because they did had their own party.

And best of all, they learned nothing at all of it, they are still on it, 23 years later