Moving to Amsterdam - leave United for KLM/AF?

ACV has been my home airport for years, with SFO as hub. In a few months, hubby and I will be moving to Amsterdam, which is not a United hub.

Am I correct that staying with United means better chances of upgrades and possibly better status with non-hub AMS as home airport, but downside is far fewer flights available especially since SAS left *A?

Most of my flights will be AMS-SFO, AMS-NYC, AMS-NCE. We currently have UC infinite and CSR cards.

Unsure of how to weigh these competing factors, would appreciate opinions!