I think Google being able to buy Oracle is a bit of a stretch at this point. Oracle is 1/4 the market cap of Google. So, it seems unlikely they would have the capital available.
You are right. I was extrapolating future scenarios where Oracle or SAP trip up in their race to the Cloud, causing a major drop in their stock. Honestly it's a pretty realistic scenario, it's not a secret that the Dell, HPE, SAP and Oracles of the world have serious challenges ahead of them. One of them is bound to hit an attractive price, and for a bold and deep-pocketed suitor to act on it. The question is when?