The FIRST misconception is that there is any actual "public need or convenience", to having millions of contracts/agreements/promises abrogated. Hams have many other ways to get on the air to mostly ragchew/DX/contest. IOW, this legislation is a poorly worded solution looking for a problem.
First, contracts are abrogated all the time for a variety of reasons. An easy example is the government's power of eminent domain, which can run roughshod over all sorts of contractual rights. There are a number of basic contractual analyses that allow for abrogating contracts independent of governmental action, such as contracts of "adhesion" (one-sided contracts by parties with unequal bargaining power), and unconscionable contracts (contracts in which one party's behavior justifies allowing the other party to escape from performance). In the law, there's nothing particularly sacred about contracts in and of themselves.
Secondly, the actual "public need or convenience" is 1) the public's need to have effective emergency communications, and 2) the public benefit of having a cadre of experienced radio operators and experimenters.
Third, as noted in the first thread on this particular forum (it's locked by one of the moderators from further comment), it's not helpful to state that hams have other alternatives than being able to build up an "effective" station in their homes. In some parts of the country (including the Denver area, where I live), it's very difficult to find housing in which outdoor antennas are allowed. If you are lucky enough to live in such an area, more power to you. Many of us don't have that opportunity.
For the record, I do live in an HOA in which limited outside antennas are allowed, and so I have some outside antennas, though not what I'd like to have. However, I remember how hard it was to find a place in which I could do this when the XYL and I were looking to buy a house. The prevalence of restrictive covenants seriously limited the options we had when selecting a home to buy. And I should point out that I am the only amateur radio operator in the whole neighborhood (about 100 homes). I wonder if the HOA will ever try to amend their covenants to exclude outdoor antennas entirely (it only takes a 3/4 vote of the neighborhood to change the covenants). I don't particularly relish the fact that I might be vulnerable to some of my neighbors in this fashion after living here for almost 20 years.