Don't worry hurworth. I don't think there's any reason to think that the kirk session images would disappear from the LDS Family History Centres just because they are being placed on ScotlandsPeople.
The parish records for example have long been on ScotlandsPeople and were still available at FHCs as well.
Also, FamilySearch gave feedback regarding the Scottish censuses disappearing, stating that it was due to a technical issue which they are trying to fix. They should be back online at some point.