I think there's a number of levels to this, and there's a big difference from not renewing STs/going fewer times to stop caring and move on to start supporting a new team
For me, I still enjoy going, said number of times its more than just the result its time spent with 4 generations of my family and my youngest is absolutely besotted with the club.
I will be getting a ST next year, even if we get relegated. There may come a time in thr future where I stop getting a ST but I'm not sure what the tipping point would be (ccfc factors not external) but I imagine I wouod still go to 5-10 games a season. I'd probably stick it (have an ST) in league two and thr national conference (5th tier), but would probably drop off and just do odd games if they went lower. I don't think we would drop out of the football league anyway even if we operate break even in league 2, I find all that scaremongering nonsense.
As for supporting another club whilst ccfc are in existance FC United style? Sorry but until ccfc officially dies I can't support any other club, I only have one team in my heart and I will not give up it officially ceases to exist. I am ccfc for life. I'm not even sure whether I could support a real Phoenix.. It would all depend on how it was set up.
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