Coauthor always postpones working on article
Not only you can remove his name, but you should remove it, if his contribution is limited to minor error correction. You can instead thank him profusely in the acknowledgements. And send the draft to him before submission, saying you will submit within a few days. 

Your third option of a blog post is also good, if you do not care too much about your publication statistics.

Excerpt from Cambridge University's guidelines on authorship:


  Normally, an author is an individual judged to have made a substantial intellectual or practical contribution to a publication and who agrees to be accountable for that contribution. This would normally include anyone who has:
  
  
  made a significant contribution to the conception or design of the project or the acquisition, analysis, or interpretation of data for the work; AND/OR
  drafted the work or reviewed/revised it critically for important intellectual content.
  
  
  This is general guidance only and may not apply to all disciplines or journals which may set different standards.
  
  Anyone listed as an author on a paper should approve the final version of the paper and accept responsibility for ensuring that he or she is familiar with its contents and can identify his or her contribution to it.
  
  Individuals who contributed to the work, but whose contributions were not of sufficient magnitude to be listed as authors should be properly acknowledged, usually in an acknowledgements section.