In principle, yes.
Note, however, that some hardware components are likely to never be supported by open-source drivers within the realistic lifetime of the Pro1.
For orientation: The Nokia N900, a relatively popular hacker's phone from 2009 (!), still has only 80-90% of its hardware supported by the mainline Kernel (personal estimate). And that's despite the fact that it originally shipped with an OS that was quite "open" compared to today's Android ...