It doesn't have to be Trump, it doesn't have to be anyone or any name in particular...but if the Republicans fail to put up a politically-incorrect outsider that fights constantly, they WILL lose. That is the only thing about Trump that sets him apart - and tapping into that is the only thing that will set the Republicans apart from the Democrats. Running on doing less of something more slowly than the Democrats will not win.
If a Republican runs within the politically-correct paradigm established by and policed by the left, and if they run within the crony-corrupt system of government established by the political elite, the takers, they WILL lose. That ground is already taken and they have far too many built-in disadvantages to win on that field.
The question remains however...do the Republicans even want to win, do they want to change the direction of the old nation, or would they just prefer to continue to carve their pieces of spoils off the dead Golden Goose?