The 980Ti as stated by the Dirk’s comment use Maxwell architecture, I’m not able to find any end of support date on the site, so I’m not sure when they will drop support.

Will there come a time that i will not be able to properly use this card with linux and run (modest games) games on it?

Unfortunately you don’t need to wait to see this happens, because it’s already happening right now, indeed dx12 games have a lot of problems running on this older cards on linux, and I myself experienced this with my 1060 first with cyberpunk 2077 and after that with resident evil 2 remastered.

As even stated by doitsujin (dxvk creator):

Low D3D12 performance on Nvidia Pascal (and older) GPUs is expected and likely won’t improve much. The hardware has a bunch of limitations that make it very hard to extract good performance. Turing fares better, but only AMD actually runs reasonably well right now.

Source: https://github.com/HansKristian-Work/vkd3d-proton/issues/465#issuecomment-744092867

Because the open module is only for Turing or later GPUs, or Ada, and the open module is available for those since 2022 so it’s not that big of a news.

Sorry my bad the petition does state citizen, title edited!