Well, strictly imo of course, Delphi is still, and has been for a long time, the most productive Windows development IDE. So if you know it already, are mostly concerned with Windows development, and the cost isnt an issue, yes, going back would be a good idea.
The main downside is what has always been the main downside to Delphi - it is Windows only. I know they have a Mac version under development but I dont think there's any solid committment to a release date on that yet.
Another downside is that its not as popular as it once was. So if the goal is to appear more attractive to potential employers, something like C# might be a better option for you. Plus not being as popular means that there's not as many 3rd party libraries/headers as there used to be.
But if you just want to get some apps built fast for Windows, Delphi is still hard to beat.