Forever is a long time. On current gen systems maybe not. But if you wanted a game made for 4K or 8K monitors then definitely. Almost all textures end up getting compressed before being pressed onto the disc. If you look at something like Rage, that game was over a terabyte uncompressed. At the time it wasn't feasible to release a version more than 25 GB, but they could have made a 100 GB version if they wanted. So long story short, yes, definitely. Maybe not anytime soon but eventually.
Well that is supposing that it will ever be proffitable that amount of work on a game... If at 40GB the game it is already bordering on financially unfeasable, then if they ever reach 100GB+ it probably is insanity as of now.
Forever is a long time, but will we and consoles live long enough reach those extremes? With every variable from digital distribution, to development costs it is hard to say if it will ever happen.
You can't compare size to cost quite that linearly. As texture sizes go up, the tools used to create them get better. At some point purely photo realistic super high res textures become the norm, which are no harder to create, they are just huge. Textures are by far the largest contributor to game size in the modern era.
This of course assumes we continue to use textured polygons for rendering, which as of right now seems likely for the foreseeable future, but who knows in ten or fifteen years.
Yeah, but haven't costs been rising with the high tech graphics? Tools can minimize the increased financial effort, but can't reverse it. Costs in AAA from sd to hdtv have rising quite significantly despite the increasingly better tools.
But in your argument you have forgotten that the textures are designed by people that have to be paid, and the resolution improves so does the work slow down, as well as as much more textures are employed as much more people and/or time are needed to design those said textures. Tools can slow down the financial climb, but that's that.
I can't see costs diminuishing, as someone has to design every facet of the increasingly complicated game.