yup. Though to solve #1 people could install the groupme app on their phones.
Assuming were talking about people that don't have any apps have a simple talk and text phone.
I would say over half of Dan's SMS Twitter followers don't have internet on their phone.
Well with that being said you need an option without any apps required!
If in fact they're going to go ahead with that I'm sure, another company will start up and offer SMS.
Let the fun begin!