I think I'd broadly agree with Torchy here - I don't think the Ricoh survives as a sports arena in the long term without a football club to play in it. Cov RFC wouldn't want to move, imho - they've got a terrific set up that is well-aligned with the crowds they get. Bit like CCFC used to have at HR.
And Northampton & Leicester RFC already have well established stadiums, as I recall.
But that doesn't mean that ACL couldn't use the land for something else that could generate either a substantial one off and/or ongoing profit.
As an aside, CCFC could learn a lot from Cov RFC in how they treat their supporters. And if the Ricoh used the same quality of bar staff as the Rugby club, then they'd sell a lot more beer. This is a subject that is truly close to my heart.