Yes, Donald Trump will be the Republican presidential nominee. Donald Trump is the most popular candidate that the Republicans have at this time. People are not paying attention to other Republican candidates. Thus, for the Republicans to have a chance to win the election, Donald Trump needs to be the nominee.
Trump will be the nominee for the GOP. This is because he is packing on the delegates. The contest is not over by any means, but Trump has a following of people that is voting for him no matter how many allegations and dirt is dug up about him. The other candidates are slowly slipping away.
The Republican party does not have much of a choice, Donald Trump is very popular and is sucking lots of media attention and votes from the republican party. If the Republican party does not nominate Trump he will run as an individual which will spilt the Republican vote. This gives the Republican party the choice of Trump or a Democrat.
No, I do not believe Donald Trump will become the Republican presidential nominee because most prominent members of the GOP establishment have released public statements vilifying Trump's rhetoric and divisiveness. Although Trump has been winning most of the Republican primaries, other Republican candidates such as Ted Cruz and John Kasich are picking up steam.