Unless you poke tons of holes in those bags, you will not get aerobic decomposition. I would simply make another area for this stuff, spread it out in layers, add nitrogen, keep layering. In a few days take a pitch fork and turn it all. Get air in that mess.
This should easily make some nice compost by spring but you have to dump it out in an area with some elbow room. Nitrogen will energize the decomposers. That is what they eat for energy to do their very important job. Leaving that stuff in the bags will mean you are doing anaerobic decomposition which is very stinky, slimy...ugh. That debris might just be liquid slime by the spring.
Do you have anymore green adds for your compost? You've got mostly brown. Dumping kitchen scraps would help but then you might have a few critters. Best would be grass clippings but I am thinking you are done with that for awhile?
I haven't been able to find this kitty litter made from alfalfa in the stores but I don't go shopping much. Pure nitrogen and green addition to get your compost cooking. Makes adding nitrogen to your compost easy peasy.
Dump it out, mix it, rake it again into a pile, make sure you've added nitrogen and cover it loosely with a tarp so it doesn't blow back into your yard. Once a week go out and turn it, add moisture if it is dry and cover it back up. Loosely to allow air yet hold down the leaves from wind. Leaving it in the bags
great article on leaf compost
another article on leaf composting
anaerobic versus aerobic decomposition