You are dealing with a very political problem, not a technical one.

You can see this in that 5 people all responded to your thread already and NONE of them answered your question.  Instead, they ALL gave you answers about why they think it shouldn't be done, or why they think nobody will do it.


The simple answer to your question is:

YES.  It is technically possible.  There is nothing about SegWit that makes it technically impossible to also implement Unlimited, and there is nothing about Unlimited that makes it technically impossible to also implement SegWit.

If anyone eventually choose to do so, we will probably just fragment the system even more. You'll some some users that hate SegWit and will ONLY run Unlimited, some users that hate Unlimited and will ONLY run SegWit, some users that hate BOTH and will refuse to upgrade beyond Core version 0.12, and some users that don't care and are willing to run your "compromise".

This isn't a problem that is going to be fixed by introducing more options to fight about. Bitcoin is quite possibly destined to tear itself in half. Either there will eventually be a fork with two chains each trying to call themselves the REAL bitcoin, or a very charismatic person will show up that convinces an overwhelming majority to agree on something. All the trolls and zealots in all the discussion forums only make the fork with two chains each trying to call themselves the REAL bitcoin more likely.  They'll all blame "the other side" if it all falls apart, it's always easier to be angry at what someone else did than feel responsible for one's own actions.