That's fine, OP, but please speak with your wallet. You can remain a fan but still send the signal that they need to offer a compelling reason to spend money supporting them. Don't be one of those dickheads that gets mad when most people stop caring about something when it sucks, and whines when it is good that people then care/pay attention to it. Without "fair weather fans" your team would have no real incentive to not suck.
This is true regardless of what you're a fan of. Sadly, I see people who cop this fairweather fan bull shit when it comes to stuff like Star Wars.