Shamata and vipassana - loss of willpower

I've been meditating (somewhat regularly) about one or two years back. Mainly shamata, and vipassana lately. Today I feel that my willpower is considerably lower than before. I mean, I used to be very interested in a variety things (such as music theory, matial arts, computer programming paradigms, algorithms, and so on). And lately I'm not feeling interested in them so much as I did before. Some years ago I used to think about them, study them and practice them. Lately I'm not engaged in any of these activities, besides what relates to my job. Sometimes I think about getting involved with one or another of them, but soon I feel unwilling to get exposed to unsatisfying activities, I feel there is no sense to make effort on impermanent matters. When I started meditating I thought I wouldn't lose "my interests", and now I feel somewhat lost by this lack of enthusiasm. It doesn't feel bad at all, I'm just a bit unsure about letting my secular skills and interest fade away. I'm not sure it is ok if this unwillingness deepens. Do you think it is OK? Is it expected in the Buddhist path? Do you think I should let it happen? Or do you think there is something missing in my practice? Do you think something must be done about it? I'm asking for an advice, so I'll allow myself to be partial to choose an answer.