I could see a couple problems with this, one of them being that 3m reactivation timer. If your fleet is already being efficient then you're isolating those ships for 3 minutes and can actually likely harm how well the fleet is doing. Plus, the dangerous ships in a TCRC are already on top of the fleet by the time everyone is in. The only time the outlying ships are dangerous is during periods of high influence, at which point some yulais would be popped to reduce the incoming DPS. Otherwise it's a waste of applied DPS, when they could be focusing on the tower and let the actual sniper ships deal with it. The longer a TCRC takes the more dangerous it becomes.
Ships that spawn that far away burn towards us anyways because they're going to move within their own optimal of the primary, so you're going to be stranding those "snipers" out at the spawn points.
And as niki said, even experienced people can mess a MJD up, and a critical mass of failed MJDs....well, you get the idea.