I've seen such pattern all the time, since many years already (it started right after the Delphi 2005 fiasco). I often agree that "rewrite our software in X" is usually a bad idea. And I've also seen that happen - many companies who tried to migrate to another platform failed, either spending lots of money, either not being able to develop a product as good as they have before in Delphi, and many other failure stories. If you think about it, even TMS history had similarities with that. We were a pre-Delphi 7 component vendor company, and after that period, many component vendors went doing something else of "migrated" to .NET.
Of course there are successful stories of migration as well. But I understand the companies: I believe what scare them is Embarcadero behavior and their dependency. If they simply snap their finger and decided "no Delphi for you", many companies will have problems. But "no Delphi for you" I mean shutting down, not fixing bugs, not updating, whatever. It's a dangerous dependency. You might say "well, there are already doing that by not fixing bugs" and I would reply saying that that's the #1 reason I see companies *today* willing to migrate away from Delphi.