No, I do not think the Acer Google Chrome book is going to have any troubles. Honestly, after looking at the prices you just posted, I do not think most people will even want to use the 3G technology in the Samsung.
I don't think it will be a problem. There will probably be a 3G USB card or something like that for those that buy the Acer and demand 3g. For the most part, I think most people are just fine with Wifi only.
I have mixed feelings abiut Wi-Fi to be honest. I used it with my current laptop once when I moved house and didn't have a regular connection for a few days. I got endless warnings on the computer about the lack of security, which freaked me a bit.
Yeah, Google Chromebooks have all kinds of security protocols, and lack of the normal anti viruses. So there should be less hassle with getting connected. I think it will be more user friendly in that sense. Don't you?