Hmmmm I doubt that is an issue. Most people have a dedicated GFX card. And I doubt they really care whether people have internet connections or not. In today's market it's all about catering for the masses. And unfortunately in a world with more than 6 billion people it's not that hard to hit your target market.
I mean sure there are countries out there that have crap internet connections, but if we look at the rest of the first world (the bit that game developers target since they have money) then the rest of us (like SA, which is still largely a 3rd world country thanks to our high unemployment and poverty levels) tend to suffer. As long as people buy in and don't boycott it en masse they'll still reach their goals and not give a swazz about things (except for the occasional few that eventually do).
We also have to take into account that the next step in the gaming evolution is "social gaming". With an always online system you can more easily share your experiences with your fellow peers and basically create a "virtual village". Sure this is the realm of MMO's but looking at the latest trends one can see that games are more focused on MP. Again due to majority demand. Games with a decent MP system draws a vast number of people, even if it has a lousy story etc.
One can also foresee a system where the actions of your peers can influence the flow of your game, kinda like Guild Wars 2 is planning on doing in the long run. This will also extend the longevity to the games and therefore translating into larger profit margins for the companies, but with company lie Blizzard I doubt larger profit margins will be an issue since that just means they can bigger gaps between releases to release quality titles to the masses.
Either way whether they have the always on internet or not, someone will make a patch available to allow you to play offline. This might mean that the rest of your peers don't see your progress, but that is all up to those that get the game.
But I think I'm just going in circles now, but that is my perspective on this whole always online idea.