They might have to lower the bar to enter the market. $400 is alot to pay to make 1 initial call.
Skype is free to set up. Also Skype have 220 million users, that are already using it.
Skype works over a dial up internet connection so you don"t need broadband. True you have to pay 1 penny per minute to talk to land line folks. However I can talk for 39,900 minutes until it justifies the cost of buying an ooma.
Another feature of skype is face to face video calls. I am not willing to give up that feature.
That said Ooma is better than the old telcos so I am sure they will do well with the non-computer users.
Personally I would rather put the $400 towards a new PC and continue using Skype.