I say the more the merrier!
Let them ALL run! and then lets see who the best/last man standing will be!
I predict Cruz will destroy them all in the debates.
I am certain Cruz will win the debates. But that won’t be enough to win nomination. Because there are lot of church lady voters for Santorum who will not vote for Cruz, there are plenty of libertarian leaning voters who want smaller government above all who will vote for Rand Paul over Cruz, there are plenty of Christian fundamentalists who will prefer Huckabee over Cruz, and there are plenty of republicans who prefer a governor over a senator, who won’t vote for Cruz.
IF it is just Cruz versus Jeb Bush, Cruz has much better chance to win. If Romney jumps in, Cruz wins with ease.
Unity is the key to success. Because there are not enough conservative voters in the country to push multiple conservatives over a single RINO. Just observe past results.