This hypothesis is still considered to be relevant, explaining the fact that new media never make the "old" media disappear.  Bibliography Riepl, Wolfgang (1913). "Das Nachrichtenwesen des Altertums mit besonderer Rücksicht auf die Römer", Leipzig: Teubner. Döpfner, Mathias "The Future of Journalism" Die Welt May 8, 2006. 
This hypothesis is still considered to be relevant, explaining the fact that new media never make the "old" media disappear. The principle forms the basis for Niels Ole Finnemann's analyses of the 5 majors matrices of media, stating "the general principles in the transition from one matrix to another as follows: The emergence of a new medium is accompanied by: a) a restructuring of the whole matrix implying b) a refunctionalisation of older media c) which often results in the development of new functions, eventually utilising hitherto un-used or even unknown qualities and functions of old media, — functions which may be as important as the new medium itself. E.g., the telegraph and innovation of print media: The telegraph allowed the transmission of news across a much wider space in a much shorter time, thereby also creating a platform for the development of a new print medium: printed newspapers. d) Finally we can also observe that new media often emerge because of information overload in older media." Niels Ole Finnemann. 2001. The Internet - A new communicational Infrastructure:p. 15. Papers from The Centre for Internet Research, University of Aarhus. Bibliography Riepl, Wolfgang (1913). "Das Nachrichtenwesen des Altertums mit besonderer Rücksicht auf die Römer", Leipzig: Teubner. Döpfner, Mathias "The Future of Journalism" Die Welt May 8, 2006. Finnemann, Niels Ole (2001) "The Internet - A new Communicational Infrastructure."Papers from The Centre for Internet Research, University of Aarhus ISSN: 1601-538X (electronic version).
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The principle forms the basis for Niels Ole Finnemann's analyses of the 5 majors matrices of media, stating "the general principles in the transition from one matrix to another as follows: The emergence of a new medium is accompanied by: a) a restructuring of the whole matrix implying b) a refunctionalisation of older media c) which often results in the development of new functions, eventually utilising hitherto un-used or even unknown qualities and functions of old media, — functions which may be as important as the new medium itself. E.g., the telegraph and innovation of print media: The telegraph allowed the transmission of news across a much wider space in a much shorter time, thereby also creating a platform for the development of a new print medium: printed newspapers. d) Finally we can also observe that new media often emerge because of information overload in older media." Niels Ole Finnemann. 2001. The Internet - A new communicational Infrastructure:p. 15. Papers from The Centre for Internet Research, University of Aarhus.
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Finnemann, Niels Ole (2001) "The Internet - A new Communicational Infrastructure."Papers from The Centre for Internet Research, University of Aarhus ISSN: 1601-538X (electronic version).