Ah, yes, I've heard good things about Lazarus. The problem with it is that it uses its own language (Delphi, as you say), so it's got its own ecosystem and things. No matter how good the UI toolkit is, it's not worth giving up all the niceties of a language with an extensive ecosystem, for me.
It's a pity, because Lazarus does seem fantastic for desktop application development...
All it needs is a critical mass of users and the right support from some big names; if Go was developed outside Google it probably won't be where it is today.
I'm not a fan of Pascal, though I really enjoyed using Delphi at work many moons ago, to me promoting Lazarus is also a way to tell other IDE developers that Delphi and today Lazarus got things right; it's not just about the language.
It's a pity, because Lazarus does seem fantastic for desktop application development...