I think SISU were on the right track when they tried to get AEG involved. Personally I think if the Ricoh is going to end up a success, and we're nearing a point where the Ricoh will be of an age that it won't be a new and modern facility much longer so it needs to happen sooner rather than later, the best option is to have an organisation like AEG take ownership with the events side as their primary focus and then have CCFC, and probably at this point Wasps, as tenants both on deals that work for the respective clubs.
The sad part is, with AEG in particular, if the council had looked to sell to someone like them rather than Wasps looking at their track record the venue would have a full diary and I would say there's an above 50/50 chance that rather than ship Wasps in they would have put some money into getting CRFC into the Premiership.