I do think you are right about the Zulu's and Prussian Landwehr will have to go on general sale at some point, after all Hat will need to make a profit to keep making new sets, however I do not think the price will be very different from the price now on the Crowdfunding, it would be unfair to people who have pledged money upfront and of course it's unlikely you will have Bonus figures.
I totally respect your decision to sit on the fence nobody is sure how this new project will turn out, it is interesting that you have decided to sign up for the unmarried Zulu’s, hedging your bets by buying some but not all you need seems to be a good middle ground if you are undecided with this crowdfunding project.