Agreed entirely. It might seem a long stretch, but what if Guardiola sees him in pre-season and thinks he can fit him in his plans? If this were to occur then he'd want to give fairly strong assurances to Byrne or else it would be a season down the drain but getting gametime and the tutelage of Guardiola would surely be huge in his development. It might be a season too soon for this to occur so, yeah, a move to a good European side might be his best bet.
It's going to be one interesting summer for this lad between a potential bolt towards the Euros and an intriguing next club step to take.