The blackout calendar has always gone out a full year, so it doesn't matter when you renew, you will know what the entire year will look like FOR YOU when you renew.
We paid $350 MORE x3 this year to upgrade my husband and sons from Deluxe to Signature passes last August JUST BECAUSE we wanted to be able to visit
Disneyland park over the summer. So, we shelled out an additional $1050 for the summer park access that these passes allow. If they now change the rules and go "nevermind, come on in Deluxe AP holders!" then we will have spent $1050 for nothing. I already had a Signature AP for the parking and better discounts, so having 3 more didn't offer any additional benefit.