What Object Pascal or Pascal lacks a large enough community focused on the stuff that scientists and researchers need, ie programming language development toolkits, a language that gives you tools and libraries for developing and implementing high level languages, doing your software development in those languages you've written and dropping back down into low level Pascal and assembler when you need it.
There are so many things developed in Pascal over the years, Smalltalk, LISP and even Prolog to name a few, and even Javascript in the form of Besen, but if you want to use this stuff where do you go?
Where do you find the community that helps you develop and make progress using Pascal in your particular niche?
Delphi is also part of the problem, because it has never developed the Open Source approach that has helped other languages flourish so much, and having most Pascal developers focused on the closed environment of Windows doesn't help as well
Eg. The developers of Smart Pascal annouced that it had been open sourced and download links would appear soon, it is 3 months now and there is no link yet.
I think the original closed source culture in which it was developed it its main problem.