Hi Minkbomb.
I think I have mentioned before that OS level android firmware updates are in the hands of the chip manufacturers (in this case amlogic) not box suppliers. This is consistent across the whole field of android boxes including the many using amlogic chips.
The t8s plus runs the amlogic s812 chip. If amlogic release, for example, a working android marshmallow for s812 chips AND it is found to be stable and works consistently on Droidboxes then I am certain a firmware update for Droidboxes will be made available. The same applies to all other box suppliers running the same chip. That is the process. If it proves to not work then it would be a pointless and futile exercise foisting non working updates to users.
Without a formal release from chip manufacturer and proof that it works, I would ask you how can any reputable box supplier guarantee that a box will be supported in the long term? How can anyone reasonably answer a question like "how long will it receive updates for?". Indeed, in this world of rapidly changing technology, how long is the "long term".
Phones and tablet bought 3-4 years ago, rarely receive firmware level updates today. Do they still work - yes they do. As does my "old" Droidbox t8.
In your previous posts you bemoan the fact that Droidbox have not issued a working android lollipop update for boxes using the s802 processor (like the t8 and the t8s). I have pointed out that this is consistent right across the industry. No supplier has offered a working production box with this software (you are welcome to Google this - search criteria "amlogic s802 android lollipop update". You will see reference to a beta version but no proof on any of the forums that anyone has got it to work on this processor). Clearly lollipop has been proven by the industry not to work on boxes using this processor.
Finally you say that updates seem to have stopped for the t8s. You will be aware from the forum that a Librelec update providing Kodi 16 for the t8s is currently being tested by the community which will be released if testing proves successful.
Hopefully Droidbox can provide more information on what new boxes are in the pipeline. I see that a few android marshmallow boxes are beginning to appear across the industry (based on s9xx chips). Droidbox currently offer the budget IMxqpro 2. No doubt they Have plans to offer more powerful boxes but only they can answer that.