Replacing VNX5300 SPS

Forgive my ignorance, I have inherited this production system..

We have a faulty non-redundant SPS and have the replacement on its way.  It is plugged into a single DPE and the other DPE is plugged directly into power.

Obviously the SP that is plugged directly into the SPS is going to go offline... my naïve question is will the VNX continue to function, albeit with worse performance, if one of the SP's goes offline until SPS can be replaced and all plugged back in.  Or does it all have to come crashing down?

Thank you for any input.