Well, V1 is V1. If they later release V2, which is only V1+multiplayer, at full price, then feel free to complain or whatever. But until then multiplayer's a feature for another release. You can wait for it, I suppose, or buy V1 and have fun in the meantime.
Frankly I'd wonder how multiplayer would be rigged in a game like Command. I spent the better part of 4 days playing one scenario, say 16hrs. That's at my own speed, with frequent pauses and other in-house hijinx. Realistically how do you play that with 1 or more other people? Sure, you could have smaller games (30min to say 4 hr) that might work better, but this is a real-time game with time compression. It's not WitPAE with daily turns.
Also it appears that WarfareSims has built V1 with multiplayer expansion capacity in mind. Perhaps the 'later release' is a DLC after further development/testing and not a full-up game and technically not a 'patch'.