If you're young and are looking at another 40 years in aviation I'd say that for some of that period you MUST do something other than instruct. If you really enjoy instructing then think of the time Air Taxying (or whatever) as a sabbatical. When you get back to instructing afterwards you will have a lot more to offer your students and will know it's not true that 'those who can - do; those who can't - teach'.
If you're coming into instruction as a second career in middle-age then you've already got some 'life experience' in a different environment to broaden your view of instruction and so the time out is less of a necessity.