Hi NB,
Thank you for contacting Intel Community. For your information, the part listed is from Max II device families which are in the mature phase and they are still recommended for new designs. It should not be obsolete within these few years but the life cycle is depending on its order volume. You may subscribe to our customer notification mailing list for the notification of Altera devices when it is going to be discontinued:
https://www.intel.com/content/www/us/en/programmable/support/quality-and-reliability/pcns-and-advisories.html
I would recommend you to look for other new alternative CPLD devices such as Max V, or Max 10 device families:
https://www.intel.com/content/www/us/en/products/programmable/max-series.html
Should you have any further feedback or concern, do feel free to drop me a note.
Thank you
Regards,
Chia Ling