I really do not care if I get my physical rewards one or two months after the game release. I will get it and I do not really see the problem here.
I think all backers that pledged high amounts for physical rewards had a main goal of supplying Obsidian with enough funds to be able to make 2nd coming of BG/IWD experience.
I think Obsidian should do whatever is possible to secure as high as possible initial sales, and if they communicate their acts to backers it will all be OK, as we backers for sure want Obsidian to have great success with POE and to make great expansion for it and further to make other awesome cRPG games.
Best,
Aa