No. It's clear mainstream established Republicans do not want him to represent the party and at some point (they) will shut him down.
There is no way a candidate can win his/her party's nomination when the head of the party (in this case the RNC) and Fox News opposes them along with many other media outlets. It's all a matter of time.
However what is really at issue is more than Trump.
The (top 3 candidates) are non-establishment!
This would suggest "the people" being polled thus far really don't want a professional politician. If you add up the top 3 candidates poll percentages it comes up to over 60%. (Trump, Carson, & Fiorina).
The RNC chairman would rather see (Rubio, Kasich, or Bush) win the nomination. Thus a question remains once the RNC conducts it's (backroom politics) to get what it considers to be a "legitimate candidate"; Will the Republican voters turn out to support him in a general election? or Will they be angry over having a candidate "forced upon them" by the establishment and stay home?