Actually, Reagan's two solid wins were accomplished by a coalition of GOP conservatives, neocons, and Reagan Democrats.
There is no "conservative" figure in politics today who has a chance with either neocons or Reagan Dems. In fact, Reagan Dems are so repelled by present conservative leadership that they are flocking to the polls for HRC.
Conservatives are AT MOST 30% of the electorate, probably more like 25%. A winning strategy has to focus on rebuilding the Reagan coalition, not on trimming it down to the 25% pure essence.
I think the number is significantly higher and in both parties. However to reach that number a suitable choice must be offered. I do agree with you on that. The problem is the ones most knowledgeable are quickly labeled unelectable by the media. For example Hunter is a congressman and they can't win POTUS. Yea and first GOP POTUS was a senator or governor from what state?
Not all DEMS are Liberals but they aren't gonna cross the line to vote for GOP moderates or liberals either. If Hillary wins the Dem nod you can look for her to comfortably run to McCain's right. In doing so she'll likely win. Willie did just that twice and won while the GOP played a Big Top Circus Tent Freak Show {1996}. Many Conservatives in all parties either stayed home or voted third party.