I recently got a Sprint EVDO card for my laptop and I can now access the internet wirelessly at nearly broadband speed anywhere in the country. You are correct, satellite radio will soon be easier to access over the Net as a stream as opposed to rigging those funky antennas on top of your car or in your home.
You need to get out more. The EVDO card is only going to work well for you in the largest cities where EVDO capable towers have been installed. San Diego, Washington, DC, Atlanta, Jacksonville, Las Vegas, Salt Lake City and Lexington Park, MD are some places where I've found EVDO. Verizon has much more coverage than Sprint.
I'm frequently irritated with the integration level of my Samsung i730. I've had many experiences trying to make a voice phone call only to have the ActiveSync application launch a data connection and deny use of the voice path. Next time I'm returning to a plain phone and going with a card similar to what you have selected. My current phone is configured by Verizon to prohibit "tethered" mode where it could be my 1XRTT modem via USB to my laptop. I really just need a reliable cell phone and data coverage for my laptop when traveling. Browsing the web on my "phone" or reading e-mail on the "phone" is just not that important.