By definition, we can only desire that which we do not already posses.
When we attain one state in a continuum, it is natural to begin desiring the other state. For example, you may hear tall people say they wish they could be short, or vice versa. This is natural, because we cannot desire that which we already posses.
We can, of course, appreciate these things.
Can we also appreciate what we have at the same time as we desire something else?
I believe so.