Notes and Domino are still sold by HCL, but the market for people who can write LotusScript or understand a Notes data model has gone. Firms with decades of records in Notes databases find that every modernisation vendor wants to start from a blank database.
I spent thirteen years inside one firm's Lotus Notes estate, first building inside it in LotusScript so their investment was not thrown away, then lifting the records into SQL Server when the time came to put a client portal on top. Both are options. Which one is right depends on what the records are worth and how the firm actually uses them.
Your Silverlight app has no browser to run in. The code still says what it does.
LightSwitch generated your app. You cannot regenerate it, but you can read it.
Delphi is alive. Your Delphi 5 codebase, on components that no longer compile, is not.