This is true in some cases but I don't think it's particularly relevant to this discussion. A company running COBOL, Delphi, etc. has trouble finding developers. Netscape using C/C++ was not a problem – even today that's every mainstream browser engine and there are a ton of developers at every skill level.
Where Netscape got into trouble was in the decisions which they made: that massive rewrite was poorly timed, along with the catastrophic management failures trying to grow so quickly, and their new codebase was arguably too complex but that's not an argument against the stack unless you're claiming that certain problems couldn't happen in a different stack, which seems implausible.
Where Netscape got into trouble was in the decisions which they made: that massive rewrite was poorly timed, along with the catastrophic management failures trying to grow so quickly, and their new codebase was arguably too complex but that's not an argument against the stack unless you're claiming that certain problems couldn't happen in a different stack, which seems implausible.