This transition would be fun to watch. Mac has a huge legacy, enormous amounts of apps and sometimes it is embedded deeply in a lot of workflows that it would be very challenging to displace. Unlike the PowerPC -> Intel transition, this time round, Apple has the iOS ecosystem to tap into.

We'll probably still have 4-5 years before the Intel Macs are completely abandoned but then this is Apple we are talking about. For all intents and purposes, they might cut the umbilical cord in 6 months.

Adobe is probably the only company which can delay the complete transition for some time.

Edit - removed the line about electron. As others have pointed out, electron already runs on ARM.