Surprisingly, i got a very nice chat response today. And supporter told me that there's a tiny possibility to update all JXD smart consoles in a near future. Surely will be updates for Singularity first (since is their best one and its so much easier) and maybe, just maybe a few last updates for s7800/s5800.
That said, i'm happy with my 3-years old s7800 with a pure RK3188 (not that weird T model). Some buttons won't work anymore, left stick is shattered and there's a button-related touchscreen weird behavior (which i take under control using Tincore) but i can still using it for some Android games. It's a warrior, i think it last enought for me.