In fairness that's not really it back firing.
We can't keep him forever but we do need to keep him this season. It's just down to the club now to make sure they support Koeman in the market to get a team around him that has a chance of doing that. We messed up a bit chance last season to buy well and make a realistic attempt of top 4. We shouldn't make the same mistake again because it could be years before we have a striker like Rom and frankly without one the rest of the team needs to be fantastic (like Arsenal) to have a chance.
Who knows, if we have money and top 4 next season he may not want to move.