Then Monisha Kaltenborn happened. Although Sauber had a reputation for being a boring team much earlier too.
I'd say let Ericsson drive around at Sauber. Imagine him taking a seat at a seriously competitive team, like Force India.
But if I was him, I'd tell Sauber to not sign rookies and academy drivers, I'd sign some kind of master development driver next to Ericsson and maybe turn that Sauber into something eventually. The Swedes are happy enough with one of their own in F1 and unless that money flow gets cut off, Ericsson is here to stay.