Your apps will still be containerised, distributed and wired up the same way.
There's always a point at which it makes engineering sense to flip the switch to doing it yourself. But that frontier is never static. We (plus our peers in the Cloud Foundry Foundation) and others in this space like Red Hat OpenShift are constantly pushing back the tipping point at which it makes economic sense to DIY.
We already have very large customers with very large engineering teams, who've built platforms before. And they are switching because that effort no longer makes business sense. It's an expense they don't need for a platform they're the only maintainers of.
One of our peers at IBM wrote about DIY[0]. We have our own much more markety-businessy whitepaper, with a very detailed case, on the same topic[1].
[0] https://hackernoon.com/stop-spending-engineering-effort-solv...
[1] https://content.pivotal.io/white-papers/the-upside-down-econ...
Disclosure: I work for Pivotal, etc.