to say 3rd party developers arn't interested is false information, which is the basis of the OP's point. Many 3rd party devs are showing interest but not to the point they're shipping over all their major IPs just yet.
EA chief financial officer Blake Jorgensen told the Wall Street Journal the publisher plans to wait until the console has been on the market a full year before deciding whether to make more games for it.
This is not the dead end response according to the OP, nor does Activision's refusal to comment on COD mean the publisheris drawing a line on the idea, exactly the opposite. Very few developers are willing or able to disclose information on this matter unless its a clear company plan and at this point in the Switch's lifespan, I don't think many devs were expecting this level of success after the WiiU.
When the PS5 is announced, you can bet that EA and other major devs will be on board from day zero, its a safe bet, The Switch was not a safe bet, but if sales continue, the opposite will (hopefully) become the case.







