Hi Haissam,
Thank you for contacting Intel Community.
EP2C20F484C8N is from the Cyclone II device family which was introduced in 2004. It currently in a mature phase and is NOT recommended for new designs. Although it won't be obsolete within these few years the life cycle is depending on its order volume.
In the meantime, you can subscribe to our customer notification mailing list at the below link so that you can be notified when an Intel FPGA is going to be discontinued.
https://www.intel.com/content/www/us/en/programmable/support/quality-and-reliability/pcns-and-advisories.html#pdn
Please do not hesitate to let me know if you need further assistance.
Thank you
Regards,
Chia Ling