I think there are stream of consciousness writings in the third person, but was wondering about the first person. No other dialogue with other characters, just the thoughts of the protagonist as he/she experiences events, interacts with other characters, and encounters fate.
Could interest be maintained without other characters expressing their views, reasons, instructions, feelings? Or is this a stretch? Would this be a unique innovation, or have other authors already ventured in here (where angels fear to tread)?
I realize that the main character would have to be a very interesting soul, with unique personality traits, mysterious and perhaps quixotic undertones, unpredictable tendencies. And the setting, environment, supporting characters, and story would have to be exceptionally picturesque, interesting, and enticing to the senses of the reader.