I agree, it is time to split.  I think a lot of us sane conservatives have been in denial since 2008 when McCain selected Palin.  We had to write in a sane candidate over the official Republican Senate race in 2010, a bunch of couldn't bring ourselves to support a clearly unqualified candidate in the Mayor's race last year, even though the alternative was a tax and spend guy and of course we can't support Trump.  Speaking only for myself, but betting that there are a lot of others like me, I simply can't be part of any movement that includes the Pat Buchanan type "Populist Nationalist" set.  In 1965, William Buckley had the courage to make it clear that they were not welcome, in 2000, GWB, whatever his faults may be, told them to get lost, but now the Party is too weak, the takeover is complete, and our job going forward is to do the same thing with them, as the Brits have with UKIP, the French with FLN etc. allow them a voice, but coalesce as necessary to keep them out of power.