Kasich the moderate?

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He's not entirely out of it either:

The South, a region where he's been particularly weak, is practically done voting. And many big Northeastern, Midwestern, and West Coast states — states where a mainstream alternative to Trump and Cruz could catch on — haven't yet voted. So Kasich is still hoping he could be that mainstream alternative, pick up lots of delegates, and become a serious player at a contested convention.

Rubio tried to give Kasich an olive branch. Then Kasich's campaign lit it on fire. - Vox

A scenario could develop where Trump doesn't get a majority and Kasich is put forward as the reasonable alternative, but that rest on at least two conditions:

• Trump not getting a majority
  
• Kasich getting enough delegates to still be a player.
  

Both seem a bit of a stretch, at this moment, and so does the idea of a brokered convention.