Not to mention either that, even if a 4k undertaking were made 15 years from now, I'd much rather they use CGI FX from 2026 to enhance it than 2011 FX...
Just saying...
In any case, that's usually why most films will have SEVERAL remasterings over time, as digital processing technology improves and, more importantly, become cheaper. This is a natural part of the process, as new techniques come out, and old ones are refined and become less expensive, they're deployed over and over again against aging films, to squeeze every bit of quality out of them before the original film stock ages to a point that it's no longer in usable condition and it's lost forever.
By way of example, TOS has been remastered twice, now, hasn't it? If I recall correctly, back in the early 2000's when it first aired on the (then) SciFi channel, it had a quick and dirty remastering at that point, which looked better than most broadcast versions at the time, but was still fairly rough. Contrast with the more recent remastering, which is much more thorough and much better looking (I'm talking about live action film stuff, leaving aside any FX issues for the moment). Even so, I expect there will be another, even more comprehensive mastering at some point in the future, a decade or three down the line.
In any case, I have no doubt that, at some point in the future, TNG, DS9 and Voyager will all get their proper HD remasters and appropriate FX enhancements. The question is whether that time is now, or at some point later on. It would be nice to have it now, but I don't have a problem with waiting.
The good thing, regardless of when it happens, is that, when it does, I'm sure whoever supervises the remaster will definitely make sure to get a proper 35mm archival version of the series to ensure that all this extra work will not have to be gone through again in the future, should future, even more advanced remasters happen.