We need to recognize that the Republican Party is a party without an ideology, only an appetite (for power).
Nonetheless, it is the only vehicle available by which the Tea Party can achieve victory. A third party -- a "Tea Party" -- is a fool's errand that would ensure Democrat dominance for, literally, ever.
Best that the Tea Party remain aloof and independent from the Republican Party -- influencing from outside, beyond the party's control. But, at the same time, we need to actively infiltrate the party -- with the aim of eventually controlling the leadership.
This was how the radical left took over the Democrat party. In 1968, they were across the street, in Grant Park, protesting the Democrat National Convention. In 1972, they were inside the building.
For 2016, it is critical that conservatives coalesce around a single conservative option early on. Or else the conservative gaggle will just get Romneyfied again.