Interest in something changes over time, it is natural and a sign that you are a rational human being. There is no prize for being an unwavering zealot (unless you enjoy that in itself).
What you feel is what really matters. Sports is an entertainment product, so what most people get out of it is entertainment. If it is not providing you with what you want, and/or there are other things that provide it better, then the smart thing to do is to change what you are doing. We all only have a set amount of time, needlessly wasting it is a tragedy.
The concept of team loyalty is only marketing scheme to try to keep your attention and money when the business is failing to providing a service you desire. This goes beyond sports. It is easy to play off our natural tribalistic tenancies to manipulate people. Businessmen, politicians and religions have abused this for ages. True happiness comes from seeing through this, figuring out what you really want and pursuing it. Relentlessly reevaluating to ensure you are spending your time the best you can.
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