Mate it's not been the Labour Party for 50 'kin years
The Labour Party even under Blair had a programme that attempted to close the gap in terms of living standards and taking a bit more control over the economy. What sets this lot apart - despite all their bollocks about consulting trade unions where it's appropriate - is that they are a dyed in the wool capitalist party and proud of it.
I know Mandelson under Blair was famously caught saying "I'm very relaxed about people becoming filthy rich", but he was by no means typical of even Blairism. Starmer's words however are "we're not just a pro-business party, we're a party that is proud of being pro-business"...which in conjunction with the broken promises to poorer families is a declaration that something qualitatively has changed.
The day an alternative to 'Labour' is set up then this lot will fold. Momentum have the rank and file membership and dynamism to cut free from Starmer's party, and there's plenty of unaffiliated trade unions they could tap into for funding. I can see that happening once this lot get in and sicken for good working class people from ever countenancing handing them their support again.