I can see Trump doing a lot of damage to the Republican party.
In polling Trump is leading in the Republican party. But the Republican party isn't fully behind Trump, and it's possible that a fairly sized percentage of the Republican party would do anything other than vote for Trump - They would either sit this one out or (gasp) vote for someone else.
At the same time, no matter how this plays out, Trump will loose. If you put Trump against Clinton he loses, and if you put him against Sander he also loses. Unless something huge happens running up to November, the Republican party will loose the White House for a third term.
RealClearPolitics - Election 2016 - General Election: Trump vs. Clinton
RealClearPolitics - Election 2016 - General Election: Trump vs. Sanders
If Trump is the nominee, and looses the White House for the Republican party.... That might just destroy the party.
As for the people that live and work in DC, fuck them. They need to be doing the right things for the right reasons, not for their party. If they are doing things for the party they are doing things for the wrong reasons. We need the right person to be running and win for the right reasons, not because they are better at marketing.
And as for the debt, when you look at it as a percentage of GDP it's not as bad as you think.
Right now our debt is high because we just financed two wars and then the economic issues. I am sure that our debt will come down in the next 8-16 years, no matter who is president.