22,
The "infringement" issue with the Cadet was over the name more than the mechanics. That's why it was later changed. It just did not sell.
Today, to produce ANY revolver other than the Peacemaker would require Colt to spend money they don't have on brand new tooling & equipment, starting from scratch. Projected sales would have to justify that. Based on past performance, they don't. Therefor, the money goes where sales figures do justify it.
Colt is a much smaller operation than people realize, and they've had to streamline as many operations as possible, including outsourcing a substantial percentage of their parts. They can & do buy frames & so on from outside vendors, but they'd still have to buy the equipment to do the assembly & final work.
The Colt .22 SAs certainly did sell, for a while. Like most of the other Colt revolvers, dwindling sales eventually killed it. Time to introduce a new .22 pistol? Unless it offered some spectacular advantage over the already entrenched Ruger, Browning, and to a lesser extent S&W, guns and sold for the same price, it would be a gamble at best, and Colt has no money to gamble with.
The reason the Browning pistols are selling so well is because people like 'em, not because Colt doesn't make a .22 auto.
You'd most likely be looking at a polymer-framed rimfire auto, and aside from the Colt name (which has questionable value in the modern handgun gun world) and curiosity, there wouldn't be much reason for massive numbers of buyers to flock to it.
And, again- if Colt were to bring out a DA revolver or a .22 (pistol or revolver) the guns would not be the great classics of the past, they'd be built to compete with Ruger & Taurus & S&W guns in production right now. The reason why the older guns mentioned are gone is that they couldn't.
Denis