No, the situation is totally different.
The PowerPC was falling dramatically behind general PC (x86) market. It could not compete in ether performance or power usage. IBM stopped caring about Apple and made the G5 fit for their servers and workstations, and couldn't be bothered with low-power SKUs. Apple had their backs to the wall and were forced to switch to justify their price premium.
Today Intel is the market leader. End of story. Nothing comes close in the performance and mainstream segment, and it's starting to compete with ARM in extreme low power with it's M/ULV chips.
Yes, there are some delays. Well, ****, Apple is still using the best there is, they're not falling behind anything. You're suggesting they would switch FROM the market leader to... what, a solution that doesn't even exist?
Also, why switch to ARM when they could be using Intel's new ultra low power chips that will crush ARM-anything while offering full backward compatibility?