I work remote and where we lived previously we did not have cable internet and the latency with Satellite was awful. We had a VZ jetpack that not only provided enough to work remote, we used it as our sole internet. I work for a large bank and the encrypted VPN didn't seem to be bothered with the speeds I was getting. Not sure why you need such speeds but even while cable may advertise them, you'll never get it - even hardwired. What speeds are you getting now and how?
We are currently in the planning stages of full timing in the next 2 years and I will still be working. Can't imagine why a hotspot from ATT or VZ wouldn't work. I was never concerned before, no reason why 2 years later it's not even better than it was. I am also reading that larger carriers are offering truly unlimited data without throttling for prices competitive to cable.
My advice, try a hotspot/mifi/jetpack (I was able to test one with VZ to make sure it worked before I committed to a plan) and test it. No risk and you'll know first hand. You'll never get the speeds you want, but I am doubting you actually need it.
