If we are not a conservative party, then our candidate will not be a conservative and his platform will be missing (or misrepresenting) critical conservative planks. It's really very elementary, m'dear.
What's also really elementary, is that this nation does NOT have a populace that is more CONSERVATIVE than LIBERAL. In order to win an election, a candidate must therefore attract the votes of a majority of the populace, so that the electoral college votes, from each state, give a sure and certain win to one specific candidate. If that doesn't happen, then nobody's vote counts, since the election is then thrown into the pit of elected officials in D.C.!
And since the word "conservative" has taken on a different meaning, here, than it's usual meaning ( outside of the MSM, that is ), therein lies a problem for communication.
If "many" fringe parties, with supposed "conservative" candidates spring up, as you have mused, who then, do you imagine those candidates will be? Any names come to mind? I would be very interested to know whom you imagine would come to the fore.