Even if TNG were to be "remastered," 99% of the key production staff will never be invited or asked to work on the restoration/reworking. It'll end up being another TOSR; a glorified video remix, done by different people with no direct involvement or experience with the original's production.
A lot of the TOS crew have passed on, but there are still dozens of people who worked on the show still running around. Almost all
of TNG's production staff is still in the business.