NO NO NO
Keep Cruz in the race
Kasich too
With both of them in, opposition to Trump is divided, making it easier to get a clear 1237 to prevent any divided convention (and GOPe / Big Media desperately want their divided convention to get rid of Trump)
There is an opportune time to pull the rug on the GOPe and now is not the time. If Trump gets a majority of delegates on his own (and there is at least a 50-50 chance of that now), Cruz will play a key role in uniting the party at convention time by not showing his hand now.