What is the minimum spec for GTAV? If you don't have enough Vram you don't have enough, not much you can do and even HBCC will need a reasonable buffer.
AMD's HBCC could be a good solution on such scenarios but as I said before, it first requires the game to use more VRAM that the card has but the card still needs sufficient vram.for the current scene. As.you witnesses games already exist that stream resources without requiring something like HBCC and if you had a 8GB card you wouldn't have had issues in GTA. So the value of HBCC is sandwiched between cards that have plenty of vram to spare and cards that don't have enough regardless of HBCC, and only applies to so subset of games that need to use giant data sets.
One of the reason megatexture didn't really take off was the resources required to create massive unqiue textures was prohibitive. Instead of an artist creating say a wall texture tiled across all.walls in. Room and repeated in different rooms they needed to create vast unqiue textures for each surface to really exploit the technology. That took lots of time and made for giant game files. The costs of art production dwarfs programming in many modern games. So even if there was technology to stream huge data sets most games probably won't go that route due to production costs.
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