No. Decision Altitude is just that, an altitude. If you're flying the glide slope within tolerances and you hit DA, you take the appropriate action, either transitioning to land or missed approach regardless of the status of the MM. The MM (if it's available) can maybe provide you a back up warning but it's really not part of a normal ILS approach.

Marker beacons are not required to fly an ILS and from what I'm seeing in the US, they are being phased out. I still see them in Europe. ILS to 14L in Cologne and 25L in Brussels (as examples) both have MM. On both those approaches, the MM corresponds with the missed approach point for the LOC approach to those runway. Again, both could provide a potential backup notification that you're at the missed approach point but on both approaches, DME is required and really would be the primary method of MAP identification.

So, the answer to your original question simply relates to the fact that a MM is usually positioned at a point along the ILS that equates to 200' HAT on the glide slope.