If I decided to acquire a neo900 board for myself (I'd obtain an N900 chassis in adv., of course), I would be perfectly happy running a FOSS Android ROM, perhaps Replicant, sans gapps. It would be slow, but it would be usable, and the unique hardware features of the N900 are enticing enough for me to consider it. I'm not worried about non-free firmware (which practically all network hardware requires anyway) as long as it is limited to the respective hardware, which is what's planned for the neo900 anyway.