A lot are using Hosting as their only income, if you do the sums its actually pretty easy to do but can take quite a while to get there.
If you are offering a good service then keep offering that, your company will keep growing and I think it will end up being large enough to be the only source of income and you could live off it.
I think companies doing reseller only plans is the main area that is expanding at the minute, these are growing very quickly because as you said, there are a lot of new hosts now, most of these are in reseller plans so do the maths
