The supposed demise of the Republican Party is not supported by the number of Members in the House of Representatives, the number of Incumbent Governors  or the number of State Legislatures with Republican majorities.   They are only by the skin of their teeth ahead in the Senate and may lose seats in November, but even then might keep a slim majority.  

I think that they have managed to match that remark attributed to Will Rogers, however.  They are seriously factionalized everywhere.

"I am not a member of any organized political party. I am a Democrat"   Will Rogers