I can see it happening, that is triple A games being released as download only, but not from Rockstar. The last four (Big) games they released (GTA IV, Red Dead Redemption, Mightnight Club LA and LA Noire)were later re-released in disc form including all the DLC, and in the case of RDR and GTA IV, the DLC was released separately in Disc form. This proves that Rockstar are determined to get the DLC available to every one, even people with bad/no-internet connection with their consoles. To say they would release GTA V in digital form only goes against all that. I'm no analyst but even I can see that that is sorta obvious, but by no means 100% certain.
Still, a digital-only release seems really damn unlikely.
Still, a digital-only release seems really damn unlikely.