The move was temporary as that was all the FL granted permission for. The club had to agree a return to the 'Coventry area'. If they didn't the golden share could be revoked.
If the club do ever build a new stadium it won't be in the city unless CCC rewrite the city plan. CCC have already confirmed to the CT that there is no possible site for a stadium within the city boundary.
Frankly I have zero issues if Fisher says a new stadium is being built somewhere like Ansty Park, the other side of the motorway from the Ricoh, Brandon, Warwick Uni, the airport, Ryton or any other site relatively close to the city. If he announced we were doing something similar to Wasps and moving 100 miles away it would be very different.