I dont think that big companies will use it and that secure meetings will be made with this. You still can use other tools for that, you can setup virtual private networks and use net meetings or whatever.

I see this tool as a good solution for the casual everyday-communication. It can be very helpful.
MSN is such a bad alternative. Exchanging files became worse and worse with every version, it is not reliable and I got spam from blocked persons as well. Wave sounds like the perfect alternative.

If I would be afraid about security, then I would switch to a more private tool.

But who knows, maybe they address this in the future as well with different keys, encryptions and other techniques.