I think if you are at aikido at all you are there for a reason. Also, we all go through dull patches. However anyone that is not passionate (esp. at the start)is unlikely to last. But is being long term in aikido or even being good in aikido the correct goal for that person; probably not.
I do believe you enjoy something much more and you get better results if you are passionate about it. Therefore I try to be passionate about the house work, but it doesn't seem to work; I just have to do it
There are three classes of activity; things we enjoy doing, things we need to do, things we think we need to do.