There are 3 Royal's in Alaska (Royal, Majestic, Discovery) and 4 non Royals (Crown, Grand, Ruby, Sapphire). No reason to hold out since you have 4 choices. I assume they all have the Promenade deck that you and many other long time Princess cruises ache for. We on the other hand, like the options that the Royal Class provides. Have sailed on the Discovery, will be on the Majestic next week and have future bookings on the Enchanted and Sun.
Since you like the older ships, I will assume you'll not be cruising on the Sun or the Star? Or is the Promenade deck just an Alaskan requirement for you?