Re: “ and instead try to make the leap to S/4HANA”
I think in most cases, customers will do a two-step upgrade. EhP 0/1/2/3/4/5 -> EhP7/8, then migration to S/4HANA. This can be done in one technical downtime window, if your timeline allows it. That way you only have to test once.
Really I don't think any of this is a big deal. Customers are well aware of their support window ending for hardware, operating system, database and application. This is something they have been on top of for 15 years. It's not surprising that a lot of customers are still below EhP7, because they may have plans for a major upgrade anyhow to S/4HANA. They are delaying so they don't have to do two upgrades.