First off, the manufacturers left because of different reasons unrelated to IMG decisions regarding running of the series. Audi pulled out in favour of DTM for combustion engines and Formula E for the electrics. Peugeot pulled out because they thought it looked uncertain whether electric cars would actually happen in WRX. That left VW alone as a manufacture and obviously there was no point in staying.
My point is not what is needed, but what is the reality of WRX. A World Championship is probably higher on the agenda for some wanting to go big rather than going "back". Electric cars now is a prime example of it in hopes of attracting manufacturers once again, or at least interest. This is not about rallycross overall, just the top level.
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