Personally, I think $100/hour isn't enough. But that's just me. I'd like the teaching profession to pay enough to that we get more than the people who fit the classic cliche, "those who can't do, teach".
Unfortunately, there a very dark downside to large teaching salaries. First of all, how can you put a dollar amount on what is enough when it comes to our children? You can't, so you have to go with what taxpayers can bear. But the downside is that bad teachers--and there are enough of them--who absolutely hate teaching will not leave because they cannot get a job that pays anywhere near the salary they are getting. These are people you don't want near your children. Before there was such a disparity of salaries between teachers and other jobs for people with four-year college degrees, bad teachers just left teaching.