documentclass{article}

usepackage{filecontents}

begin{filecontents}{jobname.bib}
@book{Labov1972,
    Address = {Philadelphia},
    Author = {William Labov},
    Publisher = {University of Pennsylvania Press},
    Title = {Sociolinguistic Patterns},
    Year = {1972}}

@book{Chomsky1957,
    Address = {The Hague},
    Author = {Noam Chomsky},
    Publisher = {Mouton},
    Title = {Syntactic Structures},
    Year = {1957}}
end{filecontents}

usepackage{biblatex}
addbibresource{jobname.bib}

newififbibtitle

newcommandSetBibTitle[1]{defbibtitle{#1}bibtitletrue}

bibtitletrue

SetBibTitle{My Books}

begin{document}

Test cite{Chomsky1957}.

% This doesn't fail but also doesn't change the title
ifbibtitle
    setkeys{blx@bib1}{title=bib1}
    setkeys{blx@biblist1}{title=biblist1}
    setkeys{blx@bib2}{title=bib2}
    setkeys{blx@biblist2}{title=biblist2}
    setkeys{blx@bhd}{title=bhd}
fi

printbibliography

% This fails
% printbibliography[ifbibtitle title=bibtitlefi]{}

% T.. as does this.
% printbibliography[{ifbibtitle title=bibtitlefi}]{}

end{document}

ifbibtitle
    printbibliography[title=bibtitle]
fi