I would not have the heart for such a cold turkey approach. My son Riley didn't even eat much solids at all until around the 14 month mark, and he was given a mixture of purees as well as eating finger foods from the get-go. Even now at 27 months, he still enjoys some veggies pureed, esp squash and sweet potatoes. Even though he can eat them regularly, it is something he enjoys and often has as a dessert, and I see nothing wrong with that. However, they are not the mainstay of his diet.
When we go through bouts of teething, he often will want me to help feed him, which I do as well, and when he feels better, he goes back to normal.
If I were in your situation, I would gradually decrease the amount of jar food you are giving him. eg if at breakfast you usually feed him 2 jars, I would only offer one along with a selection of finger foods. Same with other meals. Over time I would imagine he would get the idea that he needs to fill up on the extra things offered. We always found Riley ate better when meals were more of a social occasion. We ate our dinner, and he got bits off our plates and just got on with it. I think they really pick up on stress, so hard as it is, I would try to stay as relaxed as possible about all this.
Hugs to you. Having hung out on the picky eaters thread for months on here, I know how worrisome it can be when they just won't eat. I'll check back in with you later xx
