The game plays great without the promos. If someone has a compulsion to "collect it all" then the onus is on them to deal with it. Asking the publisher slow down their release schedule, and thus disrupt the playing pace for other people, seems a bit self-centered.
But if we're wishing for things, here's my wish: Paizo should sell a "big box" version of each AP that comes with everything. I would much rather buy it all at one time and go through it at whatever pace I choose than have to wait a month or two to get the next installment, risk stock-outs, etc. Basically the binge-watching model for serial content.