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.This RFE request will be rejected.
ksh is not going away.
You're referring the legacy ksh (which may be discontinued to support), but it the same ksh is implemented as mksh package which is supported by all major distros.
In fact, RSCT has already supported 'mksh' (instead of legacy ksh).
For example, you can install mksh first and then RSCT won't install the legacy ksh but use the already-installed mksh.
So, the only thing you need to do is - install "mksh" first.
Moreover, we're considering to set "explicit" dependency to mksh for coming RSCT/Linux releases.
https://www.suse.com/releasenotes/x86_64/SUSE-SLES/12-SP1/
1.4.1.3 Support for Korn Shell (ksh) Extended Until End of March 2022 Report Bug #
Support for the legacy package ksh in SLE was originally slated to end in 2017. However, many customers still depend on ksh.
Support for ksh has been extended until the end of March 2022.
Beyond that time, you can use the mksh implementation of Korn Shell (package mksh). However, as mksh is based on pdksh, there are certain functional differences. For example, its handling of pipelines is similar to Bash.
Correction: my 'vote' is NO
- as the `Vote` button only permits, rathers implies - yes.
* It is one thing to change the shell NAME (e.g., #!/usr/bin/ksh to #!/usr/bin/sh) - but it is something else to demand that /usr/bin/sh be supporting all 'bash' isms.
* So, voting NO - because what I see is not about removing dependencies of 'ksh' syntax to 'shell' independent scripts. Otherwise bash becomes a dependency - and it is not provided for AIX 7.1 or AIX 7.2 (AIX Toolbox is not officially supported, nor is it packaged as installp).
** I could have supported an RFE that stated remove ksh dependencies.