Not if he has close fights with Cruz to the end. If Cruz keeps taking some delegates from each state he loses Trump many still have difficulty finding the rest. At least the math from media sources seems to hint at this.
However, as this shows it could also benefit Trump since Kasich is probably not going anywhere
http://www.nytimes.com/2016/03/16/u...ps-loss-in-ohio-may-have-been-a-win.html?_r=0
This was the point I was trying to make and saw after Kasich's won and this is before I found the Vox article that explains it better than I can.
http://www.vox.com/2016/3/15/11224592/john-kasich
It's no surprise to me that the RNC would do this, hell they were unsure many times in recent history on their nominees and how much they fully encompasses what the RNC (not the American people) wants. I'm not saying Trump is better but they're doing plenty to hang themselves to dry and Kasich is a last ditch effort to put this into an overtime they control and not Trump's popularity.