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Perhaps this has been discussed before and I'm just late to the party, but it just feels as though MtG is moving more and more toward a multi-colored flavor (especially in Standard), to the point where mono decks aren't competitive or viable anymore. I see the new Gatecrash cards and the RtR cards, and it further solidifies my belief that MtG has progressed to the point that a single color is only part of a bigger puzzle and not a destination of its own.

Maybe I'm just too old school, but there is a charm to each color having its strengths and weaknesses. Now, however, it seems to be more about the guilds than it is the colors.

Am I offbase? 

You are half correct. The current set is indeed about two color pairs rather than monocolored decks. That said, you are correct more by coincidence than anything else. This block is specifically focused on two color pairs which is why they're being pushed so hard.

Wait a year or two and you'll see a move back towards a balance between monocolored decks and multicolored decks.

Of course, as long as it's easy to build a two color deck with the duals available, it'll always be a powerful and important option. 

Well, the most multicolor block was Shards of Alara.

5colorcontrol's being stupid, so I can't link to the "Eladamri EDH in Alara Reborn" strip.

Shadowmoor featured hybrid, Shards featured three-color (one and its allies), Invasion featured allies then enemies, and Ravnica (and Return to Ravnica) featured allies and enemies both in all sets but organized in a way to favor limited (with RTR representing each color twice in RTR and GTC while Ravnica...didn't).

Multicolor is really popular, as you can see.

Maybe in Standard but certainly not in the larger cardpools. Monocolored decks are actually pretty strong in Legacy because they are very consistent and naturally resistant to hosing in a format where there are boatloads of cards that, in one way or another, cripple decks with complicated manabases. It's also very inexpensive, comparatively speaking, because you don't have to blow $600 on lands alone for your deck.