CPP is a fully funded system where future liability is funded with real assets. It means even no one contribute to CPP it still has enough money to pay out its current benefit and future benefit for the amount it has already accrued.

Social security is a pay as you go system with very limited funding. Like you said, if the contribution stops, the program dies. I don't know why all the economists acknowledge the problem with SSB but you think it is perfectly fine.

CPP has been the role model for the pension plan offered by all western countries because of how well it has been managed.