There is absolutely nothing wrong with the lyric. He's combined the obvious questioning of belonging with a play on Freud, which should be obvious enough from the slapstick return-to-the-womb imagery at the end marking the final homecoming (do you REALLY think he will?). I have a strong hunch that the idea of the question mark is a very specific reference to the Dora case study, which adds richer layers of meaning to the whole as that particular part of the analysis points to the uncertainty not only of desire itself, but also of the desire to desire. Hence, he is asking not only what a home is, but whether he even truly desires to desire such a rooting. Further, this was an early case that even Freud admitted to overreaching on (despite it being a cornerstone of his subsequent theories), so there is a cheeky whiff of the usual hubristic self-negation percolating throughout. After all, he might say 'dunno', but he saves himself in the end. Perhaps I am overreaching myself, but I can say that while one can certainly fault the man for idiosyncratic obscurity, levying a charge of poor writing is unlikely to be a justifiable endeavor.
As for the question, it is one of the stronger songs on the album but given current tastes I doubt it would see any air play even in calmer conditions. This is, of course, only a fond hope, rarely realized even at the best of times, but he must still try...