There is absolutely no reason why you should feel obligated to update your existing ebooks.
The tools for handling MOBI files are now good enough that if someone really does not like the way a DRM-free MOBI handles em dashes, or whatever, then it should be relatively easy for them to fix the problem themselves.
If you don't still enjoy creating new ebooks, then, obviously, stop doing so. But please don't let something this minor cause you to stop. It sounds like part of the problem is that em dashes are not easy to handle in your normal work flow. My approach to this would be to ignore them (i.e. do whatever you are doing now). However, if you want to handle em dashes in new works but don't have a good way to do so - then perhaps someone can help if you provide more details.
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