Hi ,
So here is my point of view.
Life time as you said is 10-15 years. Cyclone V Soc was introduced around 2012 approx.
Having such information I can guess that 5CSEMA6F31C6 turn to NRFND around 2022 - 2027.
Is it right way to estimate life time ?
I would go for Cyclone 10 if there would be Cyclone 10 SoC. Then I would have 10 years life time, but there is not.
Having such information it is difficult to start new project with pretty big chance that 5CSEMA6F31C6 production status turn into EOL before I finish development.
So , if you tell me that 5CSEMA6F31C6 will be still active for another 5-7 years , I will go for it. So ?
Best regards
Adam Górski