We are also experiencing this issue. The customer expects BE applications to be around for another 3-4 years. This isn't an unreasonable expectation, seeing as RHEL will not retire EL7 until 2024. EL7 on POWER9 retirement date has not even been announced yet. The POWER9 EL7 only became generally available Nov, 2017 - so one would suspect RedHat to support BigEndian for around a further 10 years from that date. So I do not see BE dropping off at a significant rate any time soon.