Not all runners are the same height when new. For example, most STEP steel (with the exception of the steel for the True Shift holder) is pretty tall. Bauer LS4 is another runner that's pretty tall. I believe you have CCM +4.0 holders and steel. With the +4.0 holders, CCM made the holders taller than their previous holders, but kept the steel height the same. So the CCM steel is more of a traditional height and if the sharpener compared them to say STEP or LS4 they'd definitely look shorter, but it doesn't mean they're too short to use. If you start bottoming out on tight turns (the holders hit the ice) then you'll know it's time to replace the steel, but I understand wanting to do so a little before that time.
With all that said, I still think your blades look fine unless they're really low at the toe and heel (I can only see the middle in the picture). I've seen some players and refs skate on tiny slivers of steel and often ask them how they skate on those blades or flat out say I think it may be time for some new steel, but their steel is WAY lower than yours.
I've never let my steel get lower than half a cm and I've never had a problem transitioning to new steel as long as I use the same size and brand of steel. If I went to taller steel like Step it might take a little more time, but for the last several years I have been using CXN holders and steel and before that I was consistently using Mission Pitch holders and steel for several years (and before that I had CCM Prolite 3 holdes and steel for a good decade).