Its kind of a "damned if you do, damned if you don't" question. Quality SVHS decks have a habit of breaking down if you don't use them much, so leaving the tapes sitting indefinitely until you think you might want to watch them is risky. Then again, in a few years BluRay or solid-state storage will have taken over from DVD and you might have to do another transfer anyway.
You're probably better off archiving them to good DVD-R like Verbatim or TY, just so you have them in a digital format for fast future conversion. I have hundreds of similar recordings archived this way and I'm working on a thousand more, because I need to get rid of the tapes: they take up too much storage space, and there isn't much difference between the transfers and the original tapes when viewed on most displays. It will be quite some time before BluRay recorders and media become as cheap as current DVD, and in any case BluRay is overkill for dubbing VHS. DVD-R seems the affordable and sensible option.
Just be aware that the jury is still out on how long DVD-R really lasts in storage. You may lose a few transfers here and there over a few years time due to random "bad" discs (unlike tapes, you can't always tell a "bad" blank disc by looking at it or using it normally). Also, very VERY few flat-panel HDTV displays present SVHS or other standard def nearly as well as an ordinary Triniton CRT tv. Make a couple of test transfers and see how they look on YOUR big screen. If its acceptable to your eyes, do a lot more. If not, wait for re-runs and then make fresh recordings direct to DVD-R (although this might only make a slight improvement).
Finally, BEWARE of spending money on JVC "Pro-Series" SVHS-DVD combo recorders. When they work they're great but there have been WAY too many reported problems with the DVD drives being defective out-of-the-box on these units, and they're failure-prone even after repair. New ones at dealers are also insanely overpriced (you could buy studio DVDs of all your cable recordings for the price of one of these lemons). Standard VHS/DVD combo recorders from JVC are OK, best one is the DR-MV5 available for well under $100 used. But if you still have the original SVHS deck you recorded your tapes on, you'll be better served by just connecting that to your existing DVD recorder.