Are people with multiple top teams just casual fans? I can't even think of one team that I would gravitate to naturally in a Mets losing campaign. I mean... yea, I can usually pick a team that might be a good story like the Royals or a team to beat a rival (a la Giants in 2010 vs. the Phillies), but that changes ever year. It's the Mets and only the Mets that matter, and I can't see it being any different.
I would agree with this. The other teams I rank highly I put there because I have mild interest in them for various reasons. My ability to care about baseball begins and ends with the Giants. Once our season is over, I stop watching.