How long will it survive as other candidates declare?
The others will likely be Rubio, Santorum and Jeb Bush. I doubt Cruz will jump in and risk splitting the vote.
It seems that he has already endorsed as well:
We actually NEED TO CONSOLIDATE behind a good candidate early. We don’t want another 2012 where the conservatives & Tea Partiers split between lots of candidates, allowing Romney to take the GOP-e vote & win the primaries.
There may be issues with Rand, but he’s far & away my favorite at this point. I want him to appoint Ted Cruz to the Supreme Court. Cruz would do a great job there.