Don't always agree with you, but THAT is drop dead correct.
IMO, for at least two reasons:
i) it would reveal the extent of the RINO rot in the GOP (your point) and,
ii) it would reveal the turtle's lack of leadership skills.
I'm going to come to McConnell's defense on this, though.
Believe it or not, it's the failure and dysfunction among Democrats over the years that has driven a lot of what you are seeing in Washington today. They've done a thorough job of pissing off middle-class voters and independents across this country over the last 25 years. Over that time, they've relegated themselves to a core voter base comprised of avowed Marxists in New York City, on the West Coast, and in a bunch of urban sh!t-holes across the country. As a result of this, you have a lot of elected officials across the country who might have run as Democrats before the early 1990s but register as Republicans now just to avoid any association with the dingbats who run the Democrat Party. Unbelievable as it may sound to those who know history, the GOP has become something of a "populist" party in this country ... even while it continues to represent many of America's corporate interests.
This just makes it harder for the GOP to get a consensus on anything in Washington.