1/8 eTruggy has essentially replaced 1/10 Mini Truggy and that class replaced 1/10 SCT in my area... I used to race 2 classes for club racing but due to low turnout I only run 1 class now and only run eTruggy for larger events and series races.
In order for 1/8 eTruggy to go away, it would need to be replaced with some other class, there's just not enough turnout to support many more classes at this point.