[cutter73]

You actually can fire staff on a new team once you switch under certain conditions.

If the new team has no GM, you can click the option while negotiating for a new GM to 'Fire Staff". Also, if your new team doesn't have an OC or a DC, you can also click the option to "fire staff" to get rid of your position coaches.

So, you can go to a team with no GM, fire your coordinators during negotiating for a new GM. If this doesn't fire positional coaches as well, you can just choose the option to fire them when you negotiate to hire your coordinaters.

So if you go to a team with no GM, you won't have to carry over any of the previous coaching staff for the first year if you don't want to. But, you can't choose to fire everyone except, say, your RB coach. You either lose everyone, or you keep everyone. If most of the coaches suck, it's not a big deal though.