WS website says
"Service to Amsterdam resumes on Sun Nov 13 2022 and ends on Sat Mar 25 2023"


6 months later, it turns out the pandemic didn't really change habits.....

From October 2022 ATW magazine. Which is behind a pay wall.


RETURN OF THE ROAD WARRIOR
Meanwhile, US carriers are also seeing signs of business travel returning at a good clip. “Overall, corporate bookings, if you define it in the strictest, purest sense of corporate bookings, the absolute number of passengers is down versus 2019,” [UnitedSVP-international network and alliances Patrick Quayle] said.
However, business revenue is in line with or higher than revenue in 2019 because of the strength of corporate yields.
Isom said American’s domestic business revenue was broadly 105% “of where we were in 2019.” The performance was driven by small- and medium-sized businesses, he said

As for WS joining Skyteam.
Probably not until WS can provide more lounges.
WS only has one lounge and it's not on the US side of it's operation.

Most airlines rely on leisure traffic to provide frequency for business traffic. A focus on leisure traffic shouldn't be a huge impediment to WS.