Here in Aberdeen, when I walk down the street, it varies from HSDPA to GPRS. There's occasionally University WiFi, but that only helps if I'm near a University building. This access is far from constant or consistently speedy.
History proved that these things get cheaper and become accessible to the masses.
Meanwhile, kids in Egypt who don't have mobile broadband sit at a desk in an internet cafe and photoshop away on their cheap chromebook.
I don't see what the problem is?
I can see two things happening: it increases the popularity of FLOSS software in such countries and/or companies will adjust the monthly subscription fee to be proportional to e.g. the median income.
Anyway, I think thinks can be said for both models. Regardless my worries about SaaS, I also like always having the latest version, not having to install and maintain programs, etc.
This is a "rich get richer" situation that is developing.
The problem with the centralized model is that it rather fucks over even people in developing or under-developed countries, and also places like, say, South Africa where broadband speeds are internally decent but are notoriously slow to the rest of the planet.