Sure there's hope. That's part of what makes cactus and succulents fun. I have lost hope so many times, only to later find a plant has "recovered from the dead". But if the roots are completely gone, I would consider transplanting. The soil in that pot may have broken down or become overrun with pathogens. Sterilize a sharp knife or razor with a bleach solution (1 part household bleach to 9 or 10 parts water) or any premixed, bleach-based household cleaner. De-pot the plant and remove any broken down bits of soil or dead roots. Cut away any blackened, softened parts of stem. Leave the healthy part of the plant to rest for several days in a temperate, dry area to allow the cut areas of stem or thick roots to callus. (A shelf in your house or garage is good.) Light or dark doesn't really matter at this point. Plant the callused stem in a fresh or sterilized pot. Choose a pot with approximately 1 or 2 inches on all sides of the stem you're trying to root. Much more than that, and you're inviting fungus to take hold before your plant can establish its roots in that pot. Now, some folks will tell you not to "water in" this cutting at this stage. In my climate, with my sharp-draining 80% grit and pumice or perlite, it works better if I "water in" at this point, especially since we already allowed the stem to callus. Either way, the darkness (and to lesser extent, humidity) of the soil next to the stem will encourage the stem to send out roots. The callus will help protect your stem from opportunistic pathogens entering from the soil, and may be the source of new root growth. The basic principle is that you want the soil right around the stem to be humid but not moist. Heavy dampness or (worse!) wetness will promote fungus in the soil before your plant has roots in the soil to compete. Don't put this in full sun! A bright, shady porch or maybe east-facing (morning sun) but shade or heavily filtered, dappled light after that -- even full shade should work okay, but I like to give my plants SOME ongoing energy in the form of filtered light. In a few weeks of occasional spritzing, your plant should start to have roots in the soil and you can start watering normally -- carefully at first, and with more confidence once it's clear the plant is taking up the water you give it.

I think you should have left it in it's original pot, how you went about separating the roots could have hurt the plant. I would leave it be for now, other members will have more advice for you.

Oh, that's a sweet little guy! He looks happy. I have a few Monsteras and they are experiencing slower growth this time of year. The few new leaves that exist are unfurling at a snails pace. Looking at your picture of the roots, I would say repot but no rush. Just go up a wee bit in size if you do repot. Hope that helps. Good luck to you and your lovely plant. :)

100% orchid bark is actually not a good media for these as a houseplant. Your plant is underwatered and nutrient starved. You could only have success in that mix if it was in a greenhouse with high humidity and perfectly consistent watering and fertilizing. These are not epiphytes like many orchids, they're hemiepiphytic, which in this case means that even though they grow up and use trees for support, they still send down lots of massive feeder roots and never lose contact with the moist, humusy, rich soil. These really only get overwatered if the pot has no drainage hole or the light is very, very low. Almost any regular houseplant soil works for them. I use a peat-perlite-compost mix. Many growers like to use half good-quality potting soil and half orchid mix (the finer bark-charcoal-perlite mix; not just the medium fir bark). Here is a link to another mix that works and here is another. You don't have to worry about your plant at all, since Monstera deliciosa will outgrow any of these type of bacterial and fungal ailments once you give them good light, soil, water, and fertilizer (I use a light dose of Foliage Pro at every watering). The damaged leaves won't repair, but will be quickly replaced. I would strongly suggest repotting now even though this is not a great time of year for it. Do try to make sure it has very bright light after you repot to give it the fastest recovery.