Got what I wanted, now I don't want it

This is not an earth-shattering problem but I thought that I might pose my issue to the good citizens of TAM to see if there is a way to alter my circumstance and to get an outside perspective. This definitely falls into the "be careful what you ask for" category. I have never really had strong opinions one way or the other regarding women's hair length. When we were first married, my wife had fairly long hair that went down past her shoulders. However, she quickly had it cut to where it was what you may classify as a mid-length cut (below the jaw line but off the shoulders). She kept that length for most of the past 15 years or so. Over time, I began suggesting that she cut her hair short. I'm not sure exactly why. There are some very attractive women that have short hair (Example 1, Example 2) and I think that I was trying to see something different and "exotic" to add a little spice to the relationship. My wife was very reluctant at first and it took her 6 months or so before she made up her mind to get a short cut. Finally, she had it done. When she came home she was very apprehensive and afraid of what I would say. When I saw it, it looked nice. I would say "cute", but it definitely did not have the impact that I thought it would. Now don't get me wrong. I think that she does look very good in a short cut. Its just that I now believe that I would have preferred the long (past shoulder) hair instead. Since she had it done, she has now grown to really like it. It is much easier for her to maintain, style and manage. She likes the look and she now has it cut that short each time she goes to her hair appointments. In a nutshell, I wish she would go back to long hair. But I know that I dug the hole myself by gently nudging her to get it cut short. Now that she has done it and likes it so much, is there any way that I can diplomatically encourage the long hair? I believe that I am "stuck" and I'm not going to be able to say anything without having the "But you said you wanted it..." phrase put back to me or coming off as being cruel and selfish. Anyone else ever in a similar situation?

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