Stephen Baxter is a great writer and his TimeShips spanned what seemed like one dimension of the Universe, from now to the End of time.
In a similar way I thought Sliders was on the cusp of charting space and time but in the sideways sense of possibilties.
It would have been cool to explore the limits of habitable Earths and maybe even have gone extraterrestrial. It always seemed artificial for them to arrive only on Earths with a population, and never explain that. There were rules like they would not time travel on the show and that felt artificial too.. in a lot of ways.. all the limiting rules storylines seemed its undoing. It became believe it or not more comedy and then theatrical tragedy. It was an exterme, focusing too much on individuals and then a single individual, until that individual left.. and then they jumped the shark for sure.. it could have easily opened up and passed the batton or went oribus and explained how a single individual got so lucky.. and felt very satisfying.. even leaving open the franchise to others.. remember the Quinn that tossed him a fully functional timer? One that actually worked?
As it is Sliders will have to be re-imagined one day.
I just hope like Stephen Baxter they think larger and less limiting.. they hinted at coordinates and ways of navigating the ethereal plains of existence.. and that others out there might be doing the same.. "Slide like an Egyptian" hinted at that tongue in cheek.
What I had against the Kromags was the overt beating over the head with the idea that Neaderthals or some evolved Nazi's could go maurading and conquering alternate worlds.. as if mere resources or emotion were good enough to justify why they were pursuing it. I rather liked the individual idea of exploration and curiousity (like the original HG Wells time traveler) was more likely and interesting.. coming across say one or two civilizations who thought pandimensional travel was interesting.. was okay.. but making it a focal point of storyline was hard to relate to.. (it would be like making star travel common place).
Rather it would have been nicer if they got themselves into serious trouble and the mysterious Quinn with the working timer reappeared with some answers but not all.. and they discovered they were being sponsored by a different civilization.. or one totally outside our experience..like the ones from Contact.. for their own reasons that probably would have nothing to do with us.. somethings we simply will never know.
In a lot of ways it was the American Doctor Who saga rather junior style.. as if it were Doctor Who "the early years".. keeping it grounded in hard science would have been a challenge bit fun.. and if they lifted the ban on time travel, even if only the rate of time on different worlds allowed limited travel they could have explored things that left the planet, or warming of the earth, or space and star travel.
Handing off the technology to different travelers would have been rather like the Doctor changing faces every few seasons, with only the mysterious sponsors or Quinn with the Cheshire cat grin left to maintain continuity.