The reason bike dealers are going bust is very simple:
There's not enough people buying bikes. Bikes are mostly non-essential luxury leisure purchases at a time when the cost of living is impacting sales,
Bike sale profit margins are very slim and dealership overheads are very high.
Some companies were "empire building" multiple franchises & locations on unsustainable finances.

It's got nothing to do with complex "electronic gizmos" like ride by wire throttles on modern bikes. In fact these are a benefit to dealers because they deter home maintenance so keep their workshops busy!