'Do you believe that he will actually build the wall? Or is that also just something to do for effect?'
No, Trump will definitely build the Wall and Mexico will definitely have to pay for it no matter what their ex-presidents have to say about it.
The Establishment failed in their attempt to bring Trump down last night. They threw everything they had at him. Rubio and Cruz sprang at out out of the traps hurling low blows and underhamds accusations but Trump took each blow in his stride and gave back as good as he got. Trump is still in charge of the pack.
"Donald Trump Gave As Good As He Got in the CNN Debate
Donald Trump got hit from all sides on Thursday night.
...
Trump, though, remained largely calm throughout the night, giving nearly as good as he got during two-plus hours on the Houston stage. He didn’t win every individual skirmish, but with more likely victories awaiting him on Super Tuesday, he won enough to leave Texas in the same position that he arrived: as the clear front-runner."
www.slate.com/blogs/the_slatest/2016/02/25/donald_trump_won_the_cnn_debate_by_not_losing_it.html
"Get ready for President Trump, says election whiz who’s scary accurate
A New York professor whose formula has proven accurate in every presidential election but one since 1912 says Donald Trump has a 97.6 percent chance — or better — of taking the white house if he’s the Republican nominee."
nypost.com/2016/02/25/get-ready-for-president-trump-says-election-whiz-whos-scary-accurate/
Donald Trump will build that wall and Mexico will be paying for it. Elites around the world will be in shock, nothing will be the same again, America will be on top and Trump will end their game worldwide.